Merge remote-tracking branch 'upstream/main' into features/cohost

2024-01-04 15:16:59 +11:00 · 2024-01-04 15:16:59 +11:00 · 90fe324cd1
--- a/eng/Version.Details.xml
+++ b/eng/Version.Details.xml
@ -90,14 +90,15 @@
      <Uri>https://dev.azure.com/dnceng/internal/_git/dotnet-runtime</Uri>
      <Sha>3a25a7f1cc446b60678ed25c9d829420d6321eba</Sha>
    </Dependency>
-    <Dependency Name="Microsoft.DotNet.Arcade.Sdk" Version="9.0.0-beta.23613.3">
+    <Dependency Name="Microsoft.DotNet.Arcade.Sdk" Version="8.0.0-beta.23620.2">
      <Uri>https://github.com/dotnet/arcade</Uri>
-      <Sha>b6349a217d7e2f6b5c1831702f8beef5c171da3f</Sha>
+      <Sha>84129325171e65373edef24019e1171feeb19cbc</Sha>
      <SourceBuild RepoName="arcade" ManagedOnly="true" />
    </Dependency>
-    <Dependency Name="Microsoft.DotNet.XliffTasks" Version="9.0.0-beta.23613.3">
-      <Uri>https://github.com/dotnet/arcade</Uri>
-      <Sha>b6349a217d7e2f6b5c1831702f8beef5c171da3f</Sha>
+    <Dependency Name="Microsoft.DotNet.XliffTasks" Version="1.0.0-beta.23475.1" CoherentParentDependency="Microsoft.DotNet.Arcade.Sdk">
+      <Uri>https://github.com/dotnet/xliff-tasks</Uri>
+      <Sha>73f0850939d96131c28cf6ea6ee5aacb4da0083a</Sha>
+      <SourceBuild RepoName="xliff-tasks" ManagedOnly="true" />
    </Dependency>
    <!-- Necessary for source-build. This allows Microsoft.Extensions.ObjectPool and System.Collections.Immutable packages
         to be retrieved from live source-build and their content consumed by packages produced by razor.
--- a/eng/common/build.ps1
+++ b/eng/common/build.ps1
@ -19,7 +19,6 @@ Param(
  [switch] $pack,
  [switch] $publish,
  [switch] $clean,
-  [switch] $verticalBuild,
  [switch][Alias('bl')]$binaryLog,
  [switch][Alias('nobl')]$excludeCIBinarylog,
  [switch] $ci,
@ -59,7 +58,6 @@ function Print-Usage() {
  Write-Host "  -sign                   Sign build outputs"
  Write-Host "  -publish                Publish artifacts (e.g. symbols)"
  Write-Host "  -clean                  Clean the solution"
-  Write-Host "  -verticalBuild          Run in 'vertical build' infra mode."
  Write-Host ""

  Write-Host "Advanced settings:"
@ -122,7 +120,6 @@ function Build {
    /p:Deploy=$deploy `
    /p:Test=$test `
    /p:Pack=$pack `
-    /p:ArcadeBuildVertical=$verticalBuild `
    /p:IntegrationTest=$integrationTest `
    /p:PerformanceTest=$performanceTest `
    /p:Sign=$sign `
--- a/eng/common/build.sh
+++ b/eng/common/build.sh
@ -59,7 +59,6 @@ scriptroot="$( cd -P "$( dirname "$source" )" && pwd )"
 restore=false
 build=false
 source_build=false
-vertical_build=false
 rebuild=false
 test=false
 integration_test=false
@ -106,7 +105,7 @@ while [[ $# > 0 ]]; do
    -binarylog|-bl)
      binary_log=true
      ;;
-    -excludecibinarylog|-nobl)
+    -excludeCIBinarylog|-nobl)
      exclude_ci_binary_log=true
      ;;
    -pipelineslog|-pl)
@ -130,12 +129,6 @@ while [[ $# > 0 ]]; do
      restore=true
      pack=true
      ;;
-    -verticalbuild|-vb)
-      build=true
-      vertical_build=true
-      restore=true
-      pack=true
-      ;;
    -test|-t)
      test=true
      ;;
@ -227,7 +220,6 @@ function Build {
    /p:Restore=$restore \
    /p:Build=$build \
    /p:ArcadeBuildFromSource=$source_build \
-    /p:ArcadeBuildVertical=$vertical_build \
    /p:Rebuild=$rebuild \
    /p:Test=$test \
    /p:Pack=$pack \
--- a/eng/common/cross/build-rootfs.sh
+++ b/eng/common/cross/build-rootfs.sh
@ -487,7 +487,7 @@ if [[ "$__CodeName" == "alpine" ]]; then
            -X "http://dl-cdn.alpinelinux.org/alpine/$version/main" \
            -X "http://dl-cdn.alpinelinux.org/alpine/$version/community" \
            -U $__ApkSignatureArg --root "$__RootfsDir" --arch "$__AlpineArch" \
-            search 'llvm*-libs' | grep -E '^llvm' | sort | tail -1 | sed 's/-[^-]*//2g')"
+            search 'llvm*-libs' | sort | tail -1 | sed 's/-[^-]*//2g')"
    fi

    # install all packages in one go
--- a/eng/common/cross/riscv64/tizen/tizen.patch
+++ b/eng/common/cross/riscv64/tizen/tizen.patch
@ -1,9 +0,0 @@
-diff -u -r a/usr/lib/libc.so b/usr/lib/libc.so
--- a/usr/lib64/libc.so	2016-12-30 23:00:08.284951863 +0900
-+++ b/usr/lib64/libc.so	2016-12-30 23:00:32.140951815 +0900
-@@ -2,4 +2,4 @@
-    Use the shared library, but some functions are only in
-    the static library, so try that secondarily.  */
- OUTPUT_FORMAT(elf64-littleriscv)
-GROUP ( /lib64/libc.so.6 /usr/lib64/libc_nonshared.a  AS_NEEDED ( /lib64/ld-linux-riscv64-lp64d.so.1 ) )
-+GROUP ( libc.so.6 libc_nonshared.a  AS_NEEDED ( ld-linux-riscv64-lp64d.so.1 ) )
--- a/eng/common/cross/tizen-build-rootfs.sh
+++ b/eng/common/cross/tizen-build-rootfs.sh
@ -22,10 +22,6 @@ case "$ARCH" in
        TIZEN_ARCH="x86_64"
        LINK_ARCH="x86"
        ;;
-    riscv64)
-        TIZEN_ARCH="riscv64"
-        LINK_ARCH="riscv"
-        ;;
    *)
        echo "Unsupported architecture for tizen: $ARCH"
        exit 1
@ -62,21 +58,4 @@ rm -rf $TIZEN_TMP_DIR
 echo ">>Start configuring Tizen rootfs"
 ln -sfn asm-${LINK_ARCH} ./usr/include/asm
 patch -p1 < $__TIZEN_CROSSDIR/tizen.patch
-if [[ "$TIZEN_ARCH" == "riscv64" ]]; then
-    echo "Fixing broken symlinks in $PWD"
-    rm ./usr/lib64/libresolv.so
-    ln -s ../../lib64/libresolv.so.2 ./usr/lib64/libresolv.so
-    rm ./usr/lib64/libpthread.so
-    ln -s ../../lib64/libpthread.so.0 ./usr/lib64/libpthread.so
-    rm ./usr/lib64/libdl.so
-    ln -s ../../lib64/libdl.so.2 ./usr/lib64/libdl.so
-    rm ./usr/lib64/libutil.so
-    ln -s ../../lib64/libutil.so.1 ./usr/lib64/libutil.so
-    rm ./usr/lib64/libm.so
-    ln -s ../../lib64/libm.so.6 ./usr/lib64/libm.so
-    rm ./usr/lib64/librt.so
-    ln -s ../../lib64/librt.so.1 ./usr/lib64/librt.so
-    rm ./lib/ld-linux-riscv64-lp64d.so.1
-    ln -s ../lib64/ld-linux-riscv64-lp64d.so.1 ./lib/ld-linux-riscv64-lp64d.so.1
-fi
 echo "<<Finish configuring Tizen rootfs"
--- a/eng/common/cross/tizen-fetch.sh
+++ b/eng/common/cross/tizen-fetch.sh
@ -156,28 +156,17 @@ fetch_tizen_pkgs()
    done
 }

-if [ "$TIZEN_ARCH" == "riscv64" ]; then
-    BASE="Tizen-Base-RISCV"
-    UNIFIED="Tizen-Unified-RISCV"
-else
-    BASE="Tizen-Base"
-    UNIFIED="Tizen-Unified"
-fi
-
 Inform "Initialize ${TIZEN_ARCH} base"
-fetch_tizen_pkgs_init standard $BASE
+fetch_tizen_pkgs_init standard Tizen-Base
 Inform "fetch common packages"
 fetch_tizen_pkgs ${TIZEN_ARCH} gcc gcc-devel-static glibc glibc-devel libicu libicu-devel libatomic linux-glibc-devel keyutils keyutils-devel libkeyutils
 Inform "fetch coreclr packages"
-fetch_tizen_pkgs ${TIZEN_ARCH} libgcc libstdc++ libstdc++-devel libunwind libunwind-devel lttng-ust-devel lttng-ust userspace-rcu-devel userspace-rcu
-if [ "$TIZEN_ARCH" != "riscv64" ]; then
-    fetch_tizen_pkgs ${TIZEN_ARCH} lldb lldb-devel
-fi
+fetch_tizen_pkgs ${TIZEN_ARCH} lldb lldb-devel libgcc libstdc++ libstdc++-devel libunwind libunwind-devel lttng-ust-devel lttng-ust userspace-rcu-devel userspace-rcu
 Inform "fetch corefx packages"
 fetch_tizen_pkgs ${TIZEN_ARCH} libcom_err libcom_err-devel zlib zlib-devel libopenssl11 libopenssl1.1-devel krb5 krb5-devel

 Inform "Initialize standard unified"
-fetch_tizen_pkgs_init standard $UNIFIED
+fetch_tizen_pkgs_init standard Tizen-Unified
 Inform "fetch corefx packages"
 fetch_tizen_pkgs ${TIZEN_ARCH} gssdp gssdp-devel tizen-release

--- a/eng/common/cross/toolchain.cmake
+++ b/eng/common/cross/toolchain.cmake
@ -80,9 +80,6 @@ elseif(TARGET_ARCH_NAME STREQUAL "riscv64")
    set(TOOLCHAIN "riscv64-alpine-linux-musl")
  else()
    set(TOOLCHAIN "riscv64-linux-gnu")
-    if(TIZEN)
-      set(TIZEN_TOOLCHAIN "riscv64-tizen-linux-gnu/13.1.0")
-    endif()
  endif()
 elseif(TARGET_ARCH_NAME STREQUAL "s390x")
  set(CMAKE_SYSTEM_PROCESSOR s390x)
@ -147,10 +144,6 @@ if(TIZEN)
    include_directories(SYSTEM ${CROSS_ROOTFS}/usr/lib64/gcc/${TIZEN_TOOLCHAIN}/include/c++/)
    include_directories(SYSTEM ${CROSS_ROOTFS}/usr/lib64/gcc/${TIZEN_TOOLCHAIN}/include/c++/x86_64-tizen-linux-gnu)
  endif()
-  if(TARGET_ARCH_NAME STREQUAL "riscv64")
-    include_directories(SYSTEM ${CROSS_ROOTFS}/usr/lib64/gcc/${TIZEN_TOOLCHAIN}/include/c++/)
-    include_directories(SYSTEM ${CROSS_ROOTFS}/usr/lib64/gcc/${TIZEN_TOOLCHAIN}/include/c++/riscv64-tizen-linux-gnu)
-  endif()
 endif()

 if(ANDROID)
@ -277,7 +270,7 @@ if(TARGET_ARCH_NAME MATCHES "^(arm|armel)$")
    add_toolchain_linker_flag("-L${CROSS_ROOTFS}/usr/lib")
    add_toolchain_linker_flag("-L${CROSS_ROOTFS}/usr/lib/gcc/${TIZEN_TOOLCHAIN}")
  endif()
-elseif(TARGET_ARCH_NAME MATCHES "^(arm64|x64|riscv64)$")
+elseif(TARGET_ARCH_NAME MATCHES "^(arm64|x64)$")
  if(TIZEN)
    add_toolchain_linker_flag("-B${CROSS_ROOTFS}/usr/lib64/gcc/${TIZEN_TOOLCHAIN}")
    add_toolchain_linker_flag("-L${CROSS_ROOTFS}/lib64")
@ -288,8 +281,6 @@ elseif(TARGET_ARCH_NAME MATCHES "^(arm64|x64|riscv64)$")
    add_toolchain_linker_flag("-Wl,--rpath-link=${CROSS_ROOTFS}/usr/lib64")
    add_toolchain_linker_flag("-Wl,--rpath-link=${CROSS_ROOTFS}/usr/lib64/gcc/${TIZEN_TOOLCHAIN}")
  endif()
-elseif(TARGET_ARCH_NAME STREQUAL "s390x")
-  add_toolchain_linker_flag("--target=${TOOLCHAIN}")
 elseif(TARGET_ARCH_NAME STREQUAL "x86")
  if(EXISTS ${CROSS_ROOTFS}/usr/lib/gcc/i586-alpine-linux-musl)
    add_toolchain_linker_flag("--target=${TOOLCHAIN}")
@ -337,8 +328,6 @@ if(TARGET_ARCH_NAME MATCHES "^(arm|armel)$")
  if(TARGET_ARCH_NAME STREQUAL "armel")
    add_compile_options(-mfloat-abi=softfp)
  endif()
-elseif(TARGET_ARCH_NAME STREQUAL "s390x")
-  add_compile_options("--target=${TOOLCHAIN}")
 elseif(TARGET_ARCH_NAME STREQUAL "x86")
  if(EXISTS ${CROSS_ROOTFS}/usr/lib/gcc/i586-alpine-linux-musl)
    add_compile_options(--target=${TOOLCHAIN})
--- a/eng/common/post-build/check-channel-consistency.ps1
+++ b/eng/common/post-build/check-channel-consistency.ps1
@ -7,7 +7,7 @@ try {
  . $PSScriptRoot\post-build-utils.ps1

  if ($PromoteToChannels -eq "") {
-    Write-PipelineTaskError -Type 'warning' -Message "This build won't publish assets as it's not configured to any Maestro channel. If that wasn't intended use Darc to configure a default channel using add-default-channel for this branch or to promote it to a channel using add-build-to-channel. See https://github.com/dotnet/arcade/blob/main/Documentation/Darc.md#assigning-an-individual-build-to-a-channel for more info."
+    Write-PipelineTaskError -Type 'warning' -Message "This build won't publish assets as it's not configured to any Maestro channel. If that wasn't intended use Darc to configure a default channel using add-default-channel for this branch or to promote it to a channel using add-build-to-channel. See https://github.com/dotnet/arcade/blob/master/Documentation/Darc.md#assigning-an-individual-build-to-a-channel for more info."
    ExitWithExitCode 0
  }

--- a/eng/common/post-build/redact-logs.ps1
+++ b/eng/common/post-build/redact-logs.ps1
@ -1,81 +0,0 @@
-[CmdletBinding(PositionalBinding=$False)]
-param(
-  [Parameter(Mandatory=$true, Position=0)][string] $InputPath,
-  [Parameter(Mandatory=$true)][string] $BinlogToolVersion,
-  [Parameter(Mandatory=$false)][string] $DotnetPath,
-  [Parameter(Mandatory=$false)][string] $PackageFeed = 'https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-public/nuget/v3/index.json',
-  # File with strings to redact - separated by newlines.
-  #  For comments start the line with '# ' - such lines are ignored 
-  [Parameter(Mandatory=$false)][string] $TokensFilePath,
-  [Parameter(ValueFromRemainingArguments=$true)][String[]]$TokensToRedact
-)
-
-try {
-  . $PSScriptRoot\post-build-utils.ps1
-
-  $packageName = 'binlogtool'
-
-  $dotnet = $DotnetPath
-
-  if (!$dotnet) {
-    $dotnetRoot = InitializeDotNetCli -install:$true
-    $dotnet = "$dotnetRoot\dotnet.exe"
-  }
-  
-  $toolList = & "$dotnet" tool list -g
-
-  if ($toolList -like "*$packageName*") {
-    & "$dotnet" tool uninstall $packageName -g
-  }
-
-  $toolPath  = "$PSScriptRoot\..\..\..\.tools"
-  $verbosity = 'minimal'
-  
-  New-Item -ItemType Directory -Force -Path $toolPath
-  
-  Push-Location -Path $toolPath
-
-  try {
-    Write-Host "Installing Binlog redactor CLI..."
-    Write-Host "'$dotnet' new tool-manifest"
-    & "$dotnet" new tool-manifest
-    Write-Host "'$dotnet' tool install $packageName --local --add-source '$PackageFeed' -v $verbosity --version $BinlogToolVersion"
-    & "$dotnet" tool install $packageName --local --add-source "$PackageFeed" -v $verbosity --version $BinlogToolVersion
-
-    if (Test-Path $TokensFilePath) {
-        Write-Host "Adding additional sensitive data for redaction from file: " $TokensFilePath
-        $TokensToRedact += Get-Content -Path $TokensFilePath | Foreach {$_.Trim()} | Where { $_ -notmatch "^# " }
-    }
-
-    $optionalParams = [System.Collections.ArrayList]::new()
-  
-    Foreach ($p in $TokensToRedact)
-    {
-      if($p -match '^\$\(.*\)$')
-      {
-        Write-Host ("Ignoring token {0} as it is probably unexpanded AzDO variable"  -f $p)
-      }          
-      elseif($p)
-      {
-        $optionalParams.Add("-p:" + $p) | Out-Null
-      }
-    }
-
-    & $dotnet binlogtool redact --input:$InputPath --recurse --in-place `
-      @optionalParams
-
-    if ($LastExitCode -ne 0) {
-      Write-PipelineTelemetryError -Category 'Redactor' -Type 'warning' -Message "Problems using Redactor tool (exit code: $LastExitCode). But ignoring them now."
-    }
-  }
-  finally {
-    Pop-Location
-  }
-
-  Write-Host 'done.'
-} 
-catch {
-  Write-Host $_
-  Write-PipelineTelemetryError -Category 'Redactor' -Message "There was an error while trying to redact logs. Error: $_"
-  ExitWithExitCode 1
-}
--- a/eng/common/templates/job/job.yml
+++ b/eng/common/templates/job/job.yml
@ -136,7 +136,7 @@ jobs:
        condition: and(succeeded(), in(variables['_SignType'], 'real', 'test'), eq(variables['Agent.Os'], 'Windows_NT'))

  - ${{ if and(eq(parameters.runAsPublic, 'false'), eq(variables['System.TeamProject'], 'internal')) }}:
-    - task: NuGetAuthenticate@0
+    - task: NuGetAuthenticate@1

  - ${{ if and(ne(parameters.artifacts.download, 'false'), ne(parameters.artifacts.download, '')) }}:
    - task: DownloadPipelineArtifact@2
@ -154,7 +154,7 @@ jobs:
      displayName: RichCodeNav Upload
      inputs:
        languages: ${{ coalesce(parameters.richCodeNavigationLanguage, 'csharp') }}
-        environment: ${{ coalesce(parameters.richCodeNavigationEnvironment, 'internal') }}
+        environment: ${{ coalesce(parameters.richCodeNavigationEnvironment, 'production') }}
        richNavLogOutputDirectory: $(Build.SourcesDirectory)/artifacts/bin
        uploadRichNavArtifacts: ${{ coalesce(parameters.richCodeNavigationUploadArtifacts, false) }}
      continueOnError: true
--- a/eng/common/templates/job/publish-build-assets.yml
+++ b/eng/common/templates/job/publish-build-assets.yml
@ -48,8 +48,8 @@ jobs:
    - group: AzureDevOps-Artifact-Feeds-Pats
    - name: runCodesignValidationInjection
      value: false
-    # unconditional - needed for logs publishing (redactor tool version)
-    - template: /eng/common/templates/post-build/common-variables.yml
+    - ${{ if eq(parameters.publishAssetsImmediately, 'true') }}:
+      - template: /eng/common/templates/post-build/common-variables.yml

  pool:
    # We don't use the collection uri here because it might vary (.visualstudio.com vs. dev.azure.com)
@ -72,7 +72,7 @@ jobs:
      condition: ${{ parameters.condition }}
      continueOnError: ${{ parameters.continueOnError }}
    
-    - task: NuGetAuthenticate@0
+    - task: NuGetAuthenticate@1

    - task: PowerShell@2
      displayName: Publish Build Assets
--- a/eng/common/templates/job/source-index-stage1.yml
+++ b/eng/common/templates/job/source-index-stage1.yml
@ -1,6 +1,6 @@
 parameters:
  runAsPublic: false
-  sourceIndexPackageVersion: 1.0.1-20231213.4
+  sourceIndexPackageVersion: 1.0.1-20230228.2
  sourceIndexPackageSource: https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-tools/nuget/v3/index.json
  sourceIndexBuildCommand: powershell -NoLogo -NoProfile -ExecutionPolicy Bypass -Command "eng/common/build.ps1 -restore -build -binarylog -ci"
  preSteps: []
@ -30,20 +30,20 @@ jobs:
    pool:
      ${{ if eq(variables['System.TeamProject'], 'public') }}:
        name: $(DncEngPublicBuildPool)
-        demands: ImageOverride -equals windows.vs2022.amd64.open
+        demands: ImageOverride -equals windows.vs2019.amd64.open
      ${{ if eq(variables['System.TeamProject'], 'internal') }}:
        name: $(DncEngInternalBuildPool)
-        demands: ImageOverride -equals windows.vs2022.amd64
+        demands: ImageOverride -equals windows.vs2019.amd64

  steps:
  - ${{ each preStep in parameters.preSteps }}:
    - ${{ preStep }}

  - task: UseDotNet@2
-    displayName: Use .NET 8 SDK
+    displayName: Use .NET Core SDK 6
    inputs:
      packageType: sdk
-      version: 8.0.x
+      version: 6.0.x
      installationPath: $(Agent.TempDirectory)/dotnet
      workingDirectory: $(Agent.TempDirectory)

--- a/eng/common/templates/post-build/common-variables.yml
+++ b/eng/common/templates/post-build/common-variables.yml
@ -17,8 +17,6 @@ variables:
    value: 3.0.0
  - name: SymbolToolVersion
    value: 1.0.1
-  - name: BinlogToolVersion
-    value: 1.0.8

  - name: runCodesignValidationInjection
    value: false
--- a/eng/common/templates/post-build/post-build.yml
+++ b/eng/common/templates/post-build/post-build.yml
@ -169,7 +169,7 @@ stages:
        # This is necessary whenever we want to publish/restore to an AzDO private feed
        # Since sdk-task.ps1 tries to restore packages we need to do this authentication here
        # otherwise it'll complain about accessing a private feed.
-        - task: NuGetAuthenticate@0
+        - task: NuGetAuthenticate@1
          displayName: 'Authenticate to AzDO Feeds'

        # Signing validation will optionally work with the buildmanifest file which is downloaded from
@ -187,7 +187,6 @@ stages:
          parameters:
            StageLabel: 'Validation'
            JobLabel: 'Signing'
-            BinlogToolVersion: $(BinlogToolVersion)

    - job:
      displayName: SourceLink Validation
@ -267,7 +266,7 @@ stages:
            BARBuildId: ${{ parameters.BARBuildId }}
            PromoteToChannelIds: ${{ parameters.PromoteToChannelIds }}

-        - task: NuGetAuthenticate@0
+        - task: NuGetAuthenticate@1

        - task: PowerShell@2
          displayName: Publish Using Darc
--- a/eng/common/templates/steps/publish-logs.yml
+++ b/eng/common/templates/steps/publish-logs.yml
@ -1,9 +1,6 @@
 parameters:
  StageLabel: ''
  JobLabel: ''
-  CustomSensitiveDataList: ''
-  # A default - in case value from eng/common/templates/post-build/common-variables.yml is not passed
-  BinlogToolVersion: '1.0.8'

 steps:
 - task: Powershell@2
@ -15,30 +12,7 @@ steps:
      Move-Item -Path $(Build.SourcesDirectory)/artifacts/log/Debug/* $(Build.SourcesDirectory)/PostBuildLogs/${{parameters.StageLabel}}/${{parameters.JobLabel}}/
  continueOnError: true
  condition: always()
-    
- task: PowerShell@2
-  displayName: Redact Logs
-  inputs:
-    filePath: $(Build.SourcesDirectory)/eng/common/post-build/redact-logs.ps1
-    # For now this needs to have explicit list of all sensitive data. Taken from eng/publishing/v3/publish.yml
-    # Sensitive data can as well be added to $(Build.SourcesDirectory)/eng/BinlogSecretsRedactionFile.txt'
-    #  If the file exists - sensitive data for redaction will be sourced from it
-    #  (single entry per line, lines starting with '# ' are considered comments and skipped)
-    arguments: -InputPath '$(Build.SourcesDirectory)/PostBuildLogs' 
-      -BinlogToolVersion ${{parameters.BinlogToolVersion}}
-      -TokensFilePath '$(Build.SourcesDirectory)/eng/BinlogSecretsRedactionFile.txt'
-      '$(publishing-dnceng-devdiv-code-r-build-re)'
-      '$(MaestroAccessToken)'
-      '$(dn-bot-all-orgs-artifact-feeds-rw)'
-      '$(akams-client-id)'
-      '$(akams-client-secret)'
-      '$(microsoft-symbol-server-pat)'
-      '$(symweb-symbol-server-pat)'
-      '$(dn-bot-all-orgs-build-rw-code-rw)'
-      ${{parameters.CustomSensitiveDataList}}
-  continueOnError: true
-  condition: always()
-      
+
 - task: PublishBuildArtifacts@1
  displayName: Publish Logs
  inputs:
--- a/eng/common/tools.ps1
+++ b/eng/common/tools.ps1
@ -158,13 +158,18 @@ function InitializeDotNetCli([bool]$install, [bool]$createSdkLocationFile) {
  $env:DOTNET_MULTILEVEL_LOOKUP=0

  # Disable first run since we do not need all ASP.NET packages restored.
-  $env:DOTNET_NOLOGO=1
+  $env:DOTNET_SKIP_FIRST_TIME_EXPERIENCE=1

  # Disable telemetry on CI.
  if ($ci) {
    $env:DOTNET_CLI_TELEMETRY_OPTOUT=1
  }

+  # Source Build uses DotNetCoreSdkDir variable
+  if ($env:DotNetCoreSdkDir -ne $null) {
+    $env:DOTNET_INSTALL_DIR = $env:DotNetCoreSdkDir
+  }
+
  # Find the first path on %PATH% that contains the dotnet.exe
  if ($useInstalledDotNetCli -and (-not $globalJsonHasRuntimes) -and ($env:DOTNET_INSTALL_DIR -eq $null)) {
    $dotnetExecutable = GetExecutableFileName 'dotnet'
@ -223,7 +228,7 @@ function InitializeDotNetCli([bool]$install, [bool]$createSdkLocationFile) {
  Write-PipelinePrependPath -Path $dotnetRoot

  Write-PipelineSetVariable -Name 'DOTNET_MULTILEVEL_LOOKUP' -Value '0'
-  Write-PipelineSetVariable -Name 'DOTNET_NOLOGO' -Value '1'
+  Write-PipelineSetVariable -Name 'DOTNET_SKIP_FIRST_TIME_EXPERIENCE' -Value '1'

  return $global:_DotNetInstallDir = $dotnetRoot
 }
@ -822,8 +827,7 @@ function MSBuild-Core() {
    }
  }

-  # Be sure quote the path in case there are spaces in the dotnet installation location.
-  $env:ARCADE_BUILD_TOOL_COMMAND = "`"$($buildTool.Path)`" $cmdArgs"
+  $env:ARCADE_BUILD_TOOL_COMMAND = "$($buildTool.Path) $cmdArgs"

  $exitCode = Exec-Process $buildTool.Path $cmdArgs

--- a/eng/common/tools.sh
+++ b/eng/common/tools.sh
@ -112,7 +112,7 @@ function InitializeDotNetCli {
  export DOTNET_MULTILEVEL_LOOKUP=0

  # Disable first run since we want to control all package sources
-  export DOTNET_NOLOGO=1
+  export DOTNET_SKIP_FIRST_TIME_EXPERIENCE=1

  # Disable telemetry on CI
  if [[ $ci == true ]]; then
@ -123,6 +123,11 @@ function InitializeDotNetCli {
  # so it doesn't output warnings to the console.
  export LTTNG_HOME="$HOME"

+  # Source Build uses DotNetCoreSdkDir variable
+  if [[ -n "${DotNetCoreSdkDir:-}" ]]; then
+    export DOTNET_INSTALL_DIR="$DotNetCoreSdkDir"
+  fi
+
  # Find the first path on $PATH that contains the dotnet.exe
  if [[ "$use_installed_dotnet_cli" == true && $global_json_has_runtimes == false && -z "${DOTNET_INSTALL_DIR:-}" ]]; then
    local dotnet_path=`command -v dotnet`
@ -160,7 +165,7 @@ function InitializeDotNetCli {
  Write-PipelinePrependPath -path "$dotnet_root"

  Write-PipelineSetVariable -name "DOTNET_MULTILEVEL_LOOKUP" -value "0"
-  Write-PipelineSetVariable -name "DOTNET_NOLOGO" -value "1"
+  Write-PipelineSetVariable -name "DOTNET_SKIP_FIRST_TIME_EXPERIENCE" -value "1"

  # return value
  _InitializeDotNetCli="$dotnet_root"
@ -305,7 +310,7 @@ function GetDotNetInstallScript {
      curl "$install_script_url" -sSL --retry 10 --create-dirs -o "$install_script" || {
        if command -v openssl &> /dev/null; then
          echo "Curl failed; dumping some information about dotnet.microsoft.com for later investigation"
-          echo | openssl s_client -showcerts -servername dotnet.microsoft.com  -connect dotnet.microsoft.com:443 || true
+          echo | openssl s_client -showcerts -servername dotnet.microsoft.com  -connect dotnet.microsoft.com:443
        fi
        echo "Will now retry the same URL with verbose logging."
        with_retries curl "$install_script_url" -sSL --verbose --retry 10 --create-dirs -o "$install_script" || {
@ -336,12 +341,7 @@ function InitializeBuildTool {
  # return values
  _InitializeBuildTool="$_InitializeDotNetCli/dotnet"
  _InitializeBuildToolCommand="msbuild"
-  # use override if it exists - commonly set by source-build
-  if [[ "${_OverrideArcadeInitializeBuildToolFramework:-x}" == "x" ]]; then
-    _InitializeBuildToolFramework="net8.0"
-  else
-    _InitializeBuildToolFramework="${_OverrideArcadeInitializeBuildToolFramework}"
-  fi
+  _InitializeBuildToolFramework="net8.0"
 }

 # Set RestoreNoCache as a workaround for https://github.com/NuGet/Home/issues/3116
--- a/eng/config/PublishData.json
+++ b/eng/config/PublishData.json
@ -7,8 +7,8 @@
      ],
      "vsBranch": "main",
      "vsMajorVersion": 17,
-      "insertionCreateDraftPR": false,
-      "insertionTitlePrefix": "[17.9P3]"
+      "insertionCreateDraftPR": true,
+      "insertionTitlePrefix": "[17.10 Validation]"
    },
    "release/dev17.5": {
      "nugetKind": [
@ -51,9 +51,9 @@
        "Shipping",
        "NonShipping"
      ],
-      "vsBranch": "rel/d17.9",
+      "vsBranch": "main",
      "vsMajorVersion": 17,
-      "insertionTitlePrefix": "[17.9P2]"
+      "insertionTitlePrefix": "[17.9]"
    }
  }
 }
--- a/global.json
+++ b/global.json
@ -21,6 +21,6 @@
    "rollForward": "latestPatch"
  },
  "msbuild-sdks": {
-    "Microsoft.DotNet.Arcade.Sdk": "9.0.0-beta.23613.3"
+    "Microsoft.DotNet.Arcade.Sdk": "8.0.0-beta.23620.2"
  }
 }
--- a/src/Razor/benchmarks/Microsoft.AspNetCore.Razor.Microbenchmarks/LanguageServer/RazorLanguageServerBenchmarkBase.cs
+++ b/src/Razor/benchmarks/Microsoft.AspNetCore.Razor.Microbenchmarks/LanguageServer/RazorLanguageServerBenchmarkBase.cs
@ -64,7 +64,7 @@ public class RazorLanguageServerBenchmarkBase : ProjectSnapshotManagerBenchmarkB
        var projectSnapshotManager = CreateProjectSnapshotManager();
        projectSnapshotManager.ProjectAdded(hostProject);
        var tagHelpers = CommonResources.LegacyTagHelpers;
-        var projectWorkspaceState = new ProjectWorkspaceState(tagHelpers, CodeAnalysis.CSharp.LanguageVersion.CSharp11);
+        var projectWorkspaceState = ProjectWorkspaceState.Create(tagHelpers, CodeAnalysis.CSharp.LanguageVersion.CSharp11);
        projectSnapshotManager.ProjectWorkspaceStateChanged(hostProject.Key, projectWorkspaceState);
        projectSnapshotManager.DocumentAdded(hostProject.Key, hostDocument, textLoader);
        var projectSnapshot = projectSnapshotManager.GetLoadedProject(hostProject.Key);
--- a/src/Razor/src/Microsoft.AspNetCore.Razor.ExternalAccess.RoslynWorkspace/RazorProjectInfoSerializer.cs
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.ExternalAccess.RoslynWorkspace/RazorProjectInfoSerializer.cs
@ -85,7 +85,7 @@ internal static class RazorProjectInfoSerializer
        var resolver = new CompilationTagHelperResolver(NoOpTelemetryReporter.Instance);
        var tagHelpers = await resolver.GetTagHelpersAsync(project, engine, cancellationToken).ConfigureAwait(false);

-        var projectWorkspaceState = new ProjectWorkspaceState(tagHelpers, csharpLanguageVersion);
+        var projectWorkspaceState = ProjectWorkspaceState.Create(tagHelpers, csharpLanguageVersion);

        var configurationFilePath = Path.Combine(intermediateOutputPath, configurationFileName);

--- a/src/Razor/src/Microsoft.AspNetCore.Razor.ProjectEngineHost/ProjectSystem/ProjectWorkspaceState.cs
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.ProjectEngineHost/ProjectSystem/ProjectWorkspaceState.cs
@ -17,7 +17,7 @@ internal sealed class ProjectWorkspaceState : IEquatable<ProjectWorkspaceState>
    public ImmutableArray<TagHelperDescriptor> TagHelpers { get; }
    public LanguageVersion CSharpLanguageVersion { get; }

-    public ProjectWorkspaceState(
+    private ProjectWorkspaceState(
        ImmutableArray<TagHelperDescriptor> tagHelpers,
        LanguageVersion csharpLanguageVersion)
    {
@ -25,6 +25,18 @@ internal sealed class ProjectWorkspaceState : IEquatable<ProjectWorkspaceState>
        CSharpLanguageVersion = csharpLanguageVersion;
    }

+    public static ProjectWorkspaceState Create(
+        ImmutableArray<TagHelperDescriptor> tagHelpers,
+        LanguageVersion csharpLanguageVersion = LanguageVersion.Default)
+        => tagHelpers.IsEmpty && csharpLanguageVersion == LanguageVersion.Default
+            ? Default
+            : new(tagHelpers, csharpLanguageVersion);
+
+    public static ProjectWorkspaceState Create(LanguageVersion csharpLanguageVersion)
+        => csharpLanguageVersion == LanguageVersion.Default
+            ? Default
+            : new(ImmutableArray<TagHelperDescriptor>.Empty, csharpLanguageVersion);
+
    public override bool Equals(object? obj)
        => obj is ProjectWorkspaceState other && Equals(other);

--- a/src/Razor/src/Microsoft.AspNetCore.Razor.ProjectEngineHost/ProjectSystem/RazorProjectInfo.cs
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.ProjectEngineHost/ProjectSystem/RazorProjectInfo.cs
@ -21,19 +21,19 @@ internal sealed class RazorProjectInfo

    public string SerializedFilePath { get; }
    public string FilePath { get; }
-    public RazorConfiguration? Configuration { get; }
+    public RazorConfiguration Configuration { get; }
    public string? RootNamespace { get; }
    public string DisplayName { get; }
-    public ProjectWorkspaceState? ProjectWorkspaceState { get; }
+    public ProjectWorkspaceState ProjectWorkspaceState { get; }
    public ImmutableArray<DocumentSnapshotHandle> Documents { get; }

    public RazorProjectInfo(
        string serializedFilePath,
        string filePath,
-        RazorConfiguration? configuration,
+        RazorConfiguration configuration,
        string? rootNamespace,
        string displayName,
-        ProjectWorkspaceState? projectWorkspaceState,
+        ProjectWorkspaceState projectWorkspaceState,
        ImmutableArray<DocumentSnapshotHandle> documents)
    {
        SerializedFilePath = serializedFilePath;
--- a/src/Razor/src/Microsoft.AspNetCore.Razor.ProjectEngineHost/Serialization/Json/ObjectReaders.cs
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.ProjectEngineHost/Serialization/Json/ObjectReaders.cs
@ -79,7 +79,7 @@ internal static partial class ObjectReaders
    public static ProjectSnapshotHandle ReadProjectSnapshotHandleFromProperties(JsonDataReader reader)
    {
        var projectIdString = reader.ReadNonNullString(nameof(ProjectSnapshotHandle.ProjectId));
-        var configuration = reader.ReadObjectOrNull(nameof(ProjectSnapshotHandle.Configuration), ReadConfigurationFromProperties);
+        var configuration = reader.ReadObjectOrNull(nameof(ProjectSnapshotHandle.Configuration), ReadConfigurationFromProperties) ?? RazorConfiguration.Default;
        var rootNamespace = reader.ReadStringOrNull(nameof(ProjectSnapshotHandle.RootNamespace));

        var projectId = ProjectId.CreateFromSerialized(Guid.Parse(projectIdString));
@ -101,7 +101,7 @@ internal static partial class ObjectReaders
        var tagHelpers = reader.ReadImmutableArrayOrEmpty(nameof(ProjectWorkspaceState.TagHelpers), static r => ReadTagHelper(r, useCache: true));
        var csharpLanguageVersion = (LanguageVersion)reader.ReadInt32OrZero(nameof(ProjectWorkspaceState.CSharpLanguageVersion));

-        return new ProjectWorkspaceState(tagHelpers, csharpLanguageVersion);
+        return ProjectWorkspaceState.Create(tagHelpers, csharpLanguageVersion);
    }

    public static TagHelperDescriptor ReadTagHelper(JsonDataReader reader, bool useCache)
@ -342,8 +342,8 @@ internal static partial class ObjectReaders

        var serializedFilePath = reader.ReadNonNullString(nameof(RazorProjectInfo.SerializedFilePath));
        var filePath = reader.ReadNonNullString(nameof(RazorProjectInfo.FilePath));
-        var configuration = reader.ReadObject(nameof(RazorProjectInfo.Configuration), ReadConfigurationFromProperties);
-        var projectWorkspaceState = reader.ReadObject(nameof(RazorProjectInfo.ProjectWorkspaceState), ReadProjectWorkspaceStateFromProperties);
+        var configuration = reader.ReadObject(nameof(RazorProjectInfo.Configuration), ReadConfigurationFromProperties) ?? RazorConfiguration.Default;
+        var projectWorkspaceState = reader.ReadObject(nameof(RazorProjectInfo.ProjectWorkspaceState), ReadProjectWorkspaceStateFromProperties) ?? ProjectWorkspaceState.Default;
        var rootNamespace = reader.ReadString(nameof(RazorProjectInfo.RootNamespace));
        var documents = reader.ReadImmutableArray(nameof(RazorProjectInfo.Documents), static r => r.ReadNonNullObject(ReadDocumentSnapshotHandleFromProperties));

--- a/src/Razor/src/Microsoft.AspNetCore.Razor.ProjectEngineHost/Serialization/Json/ObjectWriters.cs
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.ProjectEngineHost/Serialization/Json/ObjectWriters.cs
@ -61,7 +61,7 @@ internal static class ObjectWriters
    public static void WriteProperties(JsonDataWriter writer, ProjectSnapshotHandle value)
    {
        writer.Write(nameof(value.ProjectId), value.ProjectId.Id.ToString());
-        writer.WriteObjectIfNotNull(nameof(value.Configuration), value.Configuration, WriteProperties);
+        writer.WriteObject(nameof(value.Configuration), value.Configuration, WriteProperties);
        writer.WriteIfNotNull(nameof(value.RootNamespace), value.RootNamespace);
    }

--- a/src/Razor/src/Microsoft.AspNetCore.Razor.ProjectEngineHost/Serialization/MessagePack/Formatters/ProjectSnapshotHandleFormatter.cs
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.ProjectEngineHost/Serialization/MessagePack/Formatters/ProjectSnapshotHandleFormatter.cs
@ -23,7 +23,7 @@ internal sealed class ProjectSnapshotHandleFormatter : TopLevelFormatter<Project
        var id = GuidFormatter.Instance.Deserialize(ref reader, options);
        var projectId = ProjectId.CreateFromSerialized(id);

-        var configuration = reader.DeserializeOrNull<RazorConfiguration>(options);
+        var configuration = reader.DeserializeOrNull<RazorConfiguration>(options) ?? RazorConfiguration.Default;
        var rootNamespace = CachedStringFormatter.Instance.Deserialize(ref reader, options);

        return new(projectId, configuration, rootNamespace);
--- a/src/Razor/src/Microsoft.AspNetCore.Razor.ProjectEngineHost/Serialization/MessagePack/Formatters/ProjectWorkspaceStateFormatter.cs
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.ProjectEngineHost/Serialization/MessagePack/Formatters/ProjectWorkspaceStateFormatter.cs
@ -49,7 +49,7 @@ internal sealed class ProjectWorkspaceStateFormatter : ValueFormatter<ProjectWor
        var tagHelpers = builder.DrainToImmutable();
        var csharpLanguageVersion = (LanguageVersion)reader.ReadInt32();

-        return new ProjectWorkspaceState(tagHelpers, csharpLanguageVersion);
+        return ProjectWorkspaceState.Create(tagHelpers, csharpLanguageVersion);
    }

    public override void Serialize(ref MessagePackWriter writer, ProjectWorkspaceState value, SerializerCachingOptions options)
--- a/src/Razor/src/Microsoft.AspNetCore.Razor.ProjectEngineHost/Serialization/MessagePack/Formatters/RazorProjectInfoFormatter.cs
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.ProjectEngineHost/Serialization/MessagePack/Formatters/RazorProjectInfoFormatter.cs
@ -29,8 +29,8 @@ internal sealed class RazorProjectInfoFormatter : TopLevelFormatter<RazorProject

        var serializedFilePath = CachedStringFormatter.Instance.Deserialize(ref reader, options).AssumeNotNull();
        var filePath = CachedStringFormatter.Instance.Deserialize(ref reader, options).AssumeNotNull();
-        var configuration = reader.DeserializeOrNull<RazorConfiguration>(options);
-        var projectWorkspaceState = reader.DeserializeOrNull<ProjectWorkspaceState>(options);
+        var configuration = reader.DeserializeOrNull<RazorConfiguration>(options) ?? RazorConfiguration.Default;
+        var projectWorkspaceState = reader.DeserializeOrNull<ProjectWorkspaceState>(options) ?? ProjectWorkspaceState.Default;
        var rootNamespace = CachedStringFormatter.Instance.Deserialize(ref reader, options);
        var displayName = CachedStringFormatter.Instance.Deserialize(ref reader, options).AssumeNotNull();
        var documents = reader.Deserialize<ImmutableArray<DocumentSnapshotHandle>>(options);
--- a/src/Razor/src/Microsoft.AspNetCore.Razor.ProjectEngineHost/Serialization/ProjectSnapshotHandle.cs
+++ b/src/Razor/src/Microsoft.AspNetCore.Razor.ProjectEngineHost/Serialization/ProjectSnapshotHandle.cs
@ -10,13 +10,13 @@ namespace Microsoft.AspNetCore.Razor.Serialization;
 internal record ProjectSnapshotHandle
 {
    public ProjectId ProjectId { get; }
-    public RazorConfiguration? Configuration { get; }
+    public RazorConfiguration Configuration { get; }
    public string? RootNamespace { get; }

-    public ProjectSnapshotHandle(ProjectId projectId, RazorConfiguration? configuration, string? rootNamespace)
+    public ProjectSnapshotHandle(ProjectId projectId, RazorConfiguration configuration, string? rootNamespace)
    {
        ProjectId = projectId ?? throw new ArgumentNullException(nameof(projectId));
-        Configuration = configuration;
+        Configuration = configuration ?? throw new ArgumentNullException(nameof(configuration));
        RootNamespace = rootNamespace;
    }
 }
--- a/src/Razor/src/Microsoft.CodeAnalysis.Razor.Workspaces/DefaultProjectSnapshotProjectEngineFactory.cs
+++ b/src/Razor/src/Microsoft.CodeAnalysis.Razor.Workspaces/DefaultProjectSnapshotProjectEngineFactory.cs
@ -71,7 +71,7 @@ internal class DefaultProjectSnapshotProjectEngineFactory : ProjectSnapshotProje
            throw new ArgumentNullException(nameof(project));
        }

-        return SelectFactory(project.Configuration ?? s_defaultConfiguration, requireSerializable: false);
+        return SelectFactory(project.Configuration, requireSerializable: false);
    }

    public override IProjectEngineFactory FindSerializableFactory(IProjectSnapshot project)
@ -81,7 +81,7 @@ internal class DefaultProjectSnapshotProjectEngineFactory : ProjectSnapshotProje
            throw new ArgumentNullException(nameof(project));
        }

-        return SelectFactory(project.Configuration ?? s_defaultConfiguration, requireSerializable: true);
+        return SelectFactory(project.Configuration, requireSerializable: true);
    }

    private IProjectEngineFactory SelectFactory(RazorConfiguration configuration, bool requireSerializable = false)
--- a/src/Razor/src/Microsoft.CodeAnalysis.Razor.Workspaces/DefaultProjectWorkspaceStateGenerator.cs
+++ b/src/Razor/src/Microsoft.CodeAnalysis.Razor.Workspaces/DefaultProjectWorkspaceStateGenerator.cs
@ -129,7 +129,7 @@ internal class DefaultProjectWorkspaceStateGenerator(ProjectSnapshotManagerDispa
        var telemetryId = Guid.NewGuid();
        _telemetryReporter.ReportEvent("taghelperresolve/begin", Severity.Normal,
            new Property("id", telemetryId),
-            new Property("tagHelperCount", projectSnapshot.ProjectWorkspaceState?.TagHelpers.Length ?? 0));
+            new Property("tagHelperCount", projectSnapshot.ProjectWorkspaceState.TagHelpers.Length));

        try
        {
@ -182,7 +182,7 @@ internal class DefaultProjectWorkspaceStateGenerator(ProjectSnapshotManagerDispa
                        new Property("result", "success"),
                        new Property("tagHelperCount", tagHelpers.Length));

-                    workspaceState = new ProjectWorkspaceState(tagHelpers, csharpLanguageVersion);
+                    workspaceState = ProjectWorkspaceState.Create(tagHelpers, csharpLanguageVersion);
                }
            }
            catch (OperationCanceledException)
--- a/src/Razor/src/Microsoft.CodeAnalysis.Razor.Workspaces/ProjectSystem/DefaultProjectSnapshotManager.cs
+++ b/src/Razor/src/Microsoft.CodeAnalysis.Razor.Workspaces/ProjectSystem/DefaultProjectSnapshotManager.cs
@ -442,7 +442,12 @@ internal class DefaultProjectSnapshotManager : ProjectSnapshotManagerBase
                return false;
            }

-            var state = ProjectState.Create(Workspace.Services, projectAddedAction.HostProject);
+            var projectEngineFactory = Workspace.Services.GetRequiredService<ProjectSnapshotProjectEngineFactory>();
+
+            var state = ProjectState.Create(
+                projectEngineFactory,
+                projectAddedAction.HostProject,
+                ProjectWorkspaceState.Default);
            var newEntry = new Entry(state);

            oldSnapshot = newSnapshot = newEntry.GetSnapshot();
--- a/src/Razor/src/Microsoft.CodeAnalysis.Razor.Workspaces/ProjectSystem/DocumentState.cs
+++ b/src/Razor/src/Microsoft.CodeAnalysis.Razor.Workspaces/ProjectSystem/DocumentState.cs
@ -8,7 +8,6 @@ using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Razor.Language;
 using Microsoft.AspNetCore.Razor.PooledObjects;
-using Microsoft.CodeAnalysis.Host;
 using Microsoft.CodeAnalysis.Text;

 namespace Microsoft.CodeAnalysis.Razor.ProjectSystem;
@ -31,32 +30,24 @@ internal class DocumentState
    private VersionStamp? _version;

    public static DocumentState Create(
-        HostWorkspaceServices services,
        HostDocument hostDocument,
        Func<Task<TextAndVersion>>? loader)
    {
-        if (services is null)
-        {
-            throw new ArgumentNullException(nameof(services));
-        }
-
        if (hostDocument is null)
        {
            throw new ArgumentNullException(nameof(hostDocument));
        }

-        return new DocumentState(services, hostDocument, null, null, loader);
+        return new DocumentState(hostDocument, null, null, loader);
    }

    // Internal for testing
    internal DocumentState(
-        HostWorkspaceServices services,
        HostDocument hostDocument,
        SourceText? text,
        VersionStamp? version,
        Func<Task<TextAndVersion>>? loader)
    {
-        Services = services;
        HostDocument = hostDocument;
        _sourceText = text;
        _version = version;
@ -66,8 +57,6 @@ internal class DocumentState

    public HostDocument HostDocument { get; }

-    public HostWorkspaceServices Services { get; }
-
    public bool IsGeneratedOutputResultAvailable => ComputedState.IsResultAvailable == true;

    private ComputedStateTracker ComputedState
@ -168,7 +157,7 @@ internal class DocumentState

    public virtual DocumentState WithConfigurationChange()
    {
-        var state = new DocumentState(Services, HostDocument, _sourceText, _version, _loader)
+        var state = new DocumentState(HostDocument, _sourceText, _version, _loader)
        {
            // The source could not have possibly changed.
            _sourceText = _sourceText,
@ -183,7 +172,7 @@ internal class DocumentState

    public virtual DocumentState WithImportsChange()
    {
-        var state = new DocumentState(Services, HostDocument, _sourceText, _version, _loader)
+        var state = new DocumentState(HostDocument, _sourceText, _version, _loader)
        {
            // The source could not have possibly changed.
            _sourceText = _sourceText,
@ -199,7 +188,7 @@ internal class DocumentState

    public virtual DocumentState WithProjectWorkspaceStateChange()
    {
-        var state = new DocumentState(Services, HostDocument, _sourceText, _version, _loader)
+        var state = new DocumentState(HostDocument, _sourceText, _version, _loader)
        {
            // The source could not have possibly changed.
            _sourceText = _sourceText,
@ -222,7 +211,7 @@ internal class DocumentState

        // Do not cache the computed state

-        return new DocumentState(Services, HostDocument, sourceText, version, null);
+        return new DocumentState(HostDocument, sourceText, version, null);
    }

    public virtual DocumentState WithTextLoader(Func<Task<TextAndVersion>> loader)
@ -234,7 +223,7 @@ internal class DocumentState

        // Do not cache the computed state

-        return new DocumentState(Services, HostDocument, null, null, loader);
+        return new DocumentState(HostDocument, null, null, loader);
    }

    private ImmutableArray<IDocumentSnapshot> GetImportsCore(ProjectSnapshot project)
--- a/src/Razor/src/Microsoft.CodeAnalysis.Razor.Workspaces/ProjectSystem/IProjectSnapshot.cs
+++ b/src/Razor/src/Microsoft.CodeAnalysis.Razor.Workspaces/ProjectSystem/IProjectSnapshot.cs
@ -13,7 +13,7 @@ internal interface IProjectSnapshot
 {
    ProjectKey Key { get; }

-    RazorConfiguration? Configuration { get; }
+    RazorConfiguration Configuration { get; }
    IEnumerable<string> DocumentFilePaths { get; }

    /// <summary>
@ -31,7 +31,7 @@ internal interface IProjectSnapshot
    VersionStamp Version { get; }
    LanguageVersion CSharpLanguageVersion { get; }
    ImmutableArray<TagHelperDescriptor> TagHelpers { get; }
-    ProjectWorkspaceState? ProjectWorkspaceState { get; }
+    ProjectWorkspaceState ProjectWorkspaceState { get; }

    RazorProjectEngine GetProjectEngine();
    IDocumentSnapshot? GetDocument(string filePath);
--- a/src/Razor/src/Microsoft.CodeAnalysis.Razor.Workspaces/ProjectSystem/ProjectSnapshot.cs
+++ b/src/Razor/src/Microsoft.CodeAnalysis.Razor.Workspaces/ProjectSystem/ProjectSnapshot.cs
@ -31,7 +31,7 @@ internal class ProjectSnapshot : IProjectSnapshot

    public ProjectState State { get; }

-    public RazorConfiguration? Configuration => HostProject.Configuration;
+    public RazorConfiguration Configuration => HostProject.Configuration;

    public IEnumerable<string> DocumentFilePaths => State.Documents.Keys;

@ -53,7 +53,7 @@ internal class ProjectSnapshot : IProjectSnapshot

    public ImmutableArray<TagHelperDescriptor> TagHelpers => State.TagHelpers;

-    public ProjectWorkspaceState? ProjectWorkspaceState => State.ProjectWorkspaceState;
+    public ProjectWorkspaceState ProjectWorkspaceState => State.ProjectWorkspaceState;

    public virtual IDocumentSnapshot? GetDocument(string filePath)
    {
--- a/src/Razor/src/Microsoft.CodeAnalysis.Razor.Workspaces/ProjectSystem/ProjectState.cs
+++ b/src/Razor/src/Microsoft.CodeAnalysis.Razor.Workspaces/ProjectSystem/ProjectState.cs
@ -1,8 +1,6 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the MIT license. See License.txt in the project root for license information.

-#nullable disable
-
 using System;
 using System.Collections.Generic;
 using System.Collections.Immutable;
@ -13,7 +11,6 @@ using Microsoft.AspNetCore.Razor.Language;
 using Microsoft.AspNetCore.Razor.ProjectSystem;
 using Microsoft.AspNetCore.Razor.Utilities;
 using Microsoft.CodeAnalysis.CSharp;
-using Microsoft.CodeAnalysis.Host;
 using Microsoft.CodeAnalysis.Text;

 namespace Microsoft.CodeAnalysis.Razor.ProjectSystem;
@ -36,16 +33,17 @@ internal class ProjectState
    private static readonly ImmutableDictionary<string, ImmutableArray<string>> s_emptyImportsToRelatedDocuments = ImmutableDictionary.Create<string, ImmutableArray<string>>(FilePathNormalizer.Comparer);
    private readonly object _lock;

-    private RazorProjectEngine _projectEngine;
+    private readonly ProjectSnapshotProjectEngineFactory _projectEngineFactory;
+    private RazorProjectEngine? _projectEngine;

    public static ProjectState Create(
-        HostWorkspaceServices services,
+        ProjectSnapshotProjectEngineFactory projectEngineFactory,
        HostProject hostProject,
-        ProjectWorkspaceState projectWorkspaceState = null)
+        ProjectWorkspaceState projectWorkspaceState)
    {
-        if (services is null)
+        if (projectEngineFactory is null)
        {
-            throw new ArgumentNullException(nameof(services));
+            throw new ArgumentNullException(nameof(projectEngineFactory));
        }

        if (hostProject is null)
@ -53,20 +51,26 @@ internal class ProjectState
            throw new ArgumentNullException(nameof(hostProject));
        }

-        return new ProjectState(services, hostProject, projectWorkspaceState);
+        if (projectWorkspaceState is null)
+        {
+            throw new ArgumentNullException(nameof(projectWorkspaceState));
+        }
+
+        return new ProjectState(projectEngineFactory, hostProject, projectWorkspaceState);
    }

    private ProjectState(
-        HostWorkspaceServices services,
+        ProjectSnapshotProjectEngineFactory projectEngineFactory,
        HostProject hostProject,
        ProjectWorkspaceState projectWorkspaceState)
    {
-        Services = services;
+        _projectEngineFactory = projectEngineFactory;
        HostProject = hostProject;
        ProjectWorkspaceState = projectWorkspaceState;
        Documents = s_emptyDocuments;
        ImportsToRelatedDocuments = s_emptyImportsToRelatedDocuments;
        Version = VersionStamp.Create();
+        ProjectWorkspaceStateVersion = Version;
        DocumentCollectionVersion = Version;

        _lock = new object();
@ -100,7 +104,12 @@ internal class ProjectState
            throw new ArgumentNullException(nameof(importsToRelatedDocuments));
        }

-        Services = older.Services;
+        if (projectWorkspaceState is null)
+        {
+            throw new ArgumentNullException(nameof(projectWorkspaceState));
+        }
+
+        _projectEngineFactory = older._projectEngineFactory;
        Version = older.Version.GetNewerVersion();

        HostProject = hostProject;
@ -133,7 +142,7 @@ internal class ProjectState

        if ((difference & ClearProjectWorkspaceStateVersionMask) == 0 ||
            ProjectWorkspaceState == older.ProjectWorkspaceState ||
-            ProjectWorkspaceState?.Equals(older.ProjectWorkspaceState) == true)
+            ProjectWorkspaceState.Equals(older.ProjectWorkspaceState))
        {
            ProjectWorkspaceStateVersion = older.ProjectWorkspaceStateVersion;
        }
@ -161,11 +170,9 @@ internal class ProjectState

    public ProjectWorkspaceState ProjectWorkspaceState { get; }

-    public HostWorkspaceServices Services { get; }
+    public ImmutableArray<TagHelperDescriptor> TagHelpers => ProjectWorkspaceState.TagHelpers;

-    public ImmutableArray<TagHelperDescriptor> TagHelpers => ProjectWorkspaceState?.TagHelpers ?? ImmutableArray<TagHelperDescriptor>.Empty;
-
-    public LanguageVersion CSharpLanguageVersion => ProjectWorkspaceState?.CSharpLanguageVersion ?? LanguageVersion.Default;
+    public LanguageVersion CSharpLanguageVersion => ProjectWorkspaceState.CSharpLanguageVersion;

    /// <summary>
    /// Gets the version of this project, INCLUDING content changes. The <see cref="Version"/> is
@ -190,6 +197,19 @@ internal class ProjectState
            }

            return _projectEngine;
+
+            RazorProjectEngine CreateProjectEngine()
+            {
+                return _projectEngineFactory.Create(
+                    HostProject.Configuration,
+                    Path.GetDirectoryName(HostProject.FilePath),
+                    configure: builder =>
+                    {
+                        builder.SetRootNamespace(HostProject.RootNamespace);
+                        builder.SetCSharpLanguageVersion(CSharpLanguageVersion);
+                        builder.SetSupportLocalizedComponentNames();
+                    });
+            }
        }
    }

@ -221,7 +241,7 @@ internal class ProjectState
            return this;
        }

-        var documents = Documents.Add(hostDocument.FilePath, DocumentState.Create(Services, hostDocument, loader));
+        var documents = Documents.Add(hostDocument.FilePath, DocumentState.Create(hostDocument, loader));

        // Compute the effect on the import map
        var importTargetPaths = GetImportDocumentTargetPaths(hostDocument);
@ -360,7 +380,7 @@ internal class ProjectState
            return this;
        }

-        if (ProjectWorkspaceState != null && ProjectWorkspaceState.Equals(projectWorkspaceState))
+        if (ProjectWorkspaceState.Equals(projectWorkspaceState))
        {
            return this;
        }
@ -409,20 +429,6 @@ internal class ProjectState
        return importsToRelatedDocuments;
    }

-    private RazorProjectEngine CreateProjectEngine()
-    {
-        var factory = Services.GetRequiredService<ProjectSnapshotProjectEngineFactory>();
-        return factory.Create(
-            HostProject.Configuration,
-            Path.GetDirectoryName(HostProject.FilePath),
-            configure: builder =>
-            {
-                builder.SetRootNamespace(HostProject.RootNamespace);
-                builder.SetCSharpLanguageVersion(CSharpLanguageVersion);
-                builder.SetSupportLocalizedComponentNames();
-            });
-    }
-
    public List<string> GetImportDocumentTargetPaths(HostDocument hostDocument)
    {
        var projectEngine = ProjectEngine;
--- a/src/Razor/src/Microsoft.CodeAnalysis.Razor.Workspaces/TagHelperResolverFactory.Resolver.cs
+++ b/src/Razor/src/Microsoft.CodeAnalysis.Razor.Workspaces/TagHelperResolverFactory.Resolver.cs
@ -22,8 +22,6 @@ internal partial class TagHelperResolverFactory
            Project workspaceProject,
            IProjectSnapshot projectSnapshot,
            CancellationToken cancellationToken)
-            => projectSnapshot.Configuration is not null
-                ? _resolver.GetTagHelpersAsync(workspaceProject, projectSnapshot.GetProjectEngine(), cancellationToken)
-                : new(ImmutableArray<TagHelperDescriptor>.Empty);
+            => _resolver.GetTagHelpersAsync(workspaceProject, projectSnapshot.GetProjectEngine(), cancellationToken);
    }
 }
--- a/src/Razor/src/Microsoft.CodeAnalysis.Remote.Razor/OOPTagHelperResolver.cs
+++ b/src/Razor/src/Microsoft.CodeAnalysis.Remote.Razor/OOPTagHelperResolver.cs
@ -41,11 +41,6 @@ internal class OOPTagHelperResolver : ITagHelperResolver
        IProjectSnapshot projectSnapshot,
        CancellationToken cancellationToken)
    {
-        if (projectSnapshot.Configuration is null)
-        {
-            return ImmutableArray<TagHelperDescriptor>.Empty;
-        }
-
        // Not every custom factory supports the OOP host. Our priority system should work like this:
        //
        // 1. Use custom factory out of process
--- a/src/Razor/src/Microsoft.VisualStudio.Editor.Razor/EphemeralProjectSnapshot.cs
+++ b/src/Razor/src/Microsoft.VisualStudio.Editor.Razor/EphemeralProjectSnapshot.cs
@ -44,7 +44,7 @@ internal class EphemeralProjectSnapshot : IProjectSnapshot

    public ProjectKey Key { get; }

-    public RazorConfiguration? Configuration => FallbackRazorConfiguration.Latest;
+    public RazorConfiguration Configuration => FallbackRazorConfiguration.Latest;

    public IEnumerable<string> DocumentFilePaths => Array.Empty<string>();

@ -58,11 +58,11 @@ internal class EphemeralProjectSnapshot : IProjectSnapshot

    public VersionStamp Version => VersionStamp.Default;

-    public LanguageVersion CSharpLanguageVersion => LanguageVersion.Default;
+    public LanguageVersion CSharpLanguageVersion => ProjectWorkspaceState.CSharpLanguageVersion;

-    public ImmutableArray<TagHelperDescriptor> TagHelpers => ImmutableArray<TagHelperDescriptor>.Empty;
+    public ImmutableArray<TagHelperDescriptor> TagHelpers => ProjectWorkspaceState.TagHelpers;

-    public ProjectWorkspaceState? ProjectWorkspaceState => null;
+    public ProjectWorkspaceState ProjectWorkspaceState => ProjectWorkspaceState.Default;

    public IDocumentSnapshot? GetDocument(string filePath)
    {
--- a/src/Razor/src/Microsoft.VisualStudio.LiveShare.Razor/Host/DefaultProjectSnapshotManagerProxy.cs
+++ b/src/Razor/src/Microsoft.VisualStudio.LiveShare.Razor/Host/DefaultProjectSnapshotManagerProxy.cs
@ -6,7 +6,6 @@ using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 using System.Threading;
 using System.Threading.Tasks;
-using Microsoft.AspNetCore.Razor;
 using Microsoft.AspNetCore.Razor.ProjectSystem;
 using Microsoft.CodeAnalysis.Razor;
 using Microsoft.CodeAnalysis.Razor.ProjectSystem;
@ -125,10 +124,10 @@ internal class DefaultProjectSnapshotManagerProxy : IProjectSnapshotManagerProxy
            return null;
        }

-        var projectWorkspaceState = new ProjectWorkspaceState(project.TagHelpers, project.CSharpLanguageVersion);
+        var projectWorkspaceState = ProjectWorkspaceState.Create(project.TagHelpers, project.CSharpLanguageVersion);
        var projectFilePath = _session.ConvertLocalPathToSharedUri(project.FilePath);
        var intermediateOutputPath = _session.ConvertLocalPathToSharedUri(project.IntermediateOutputPath);
-        var projectHandleProxy = new ProjectSnapshotHandleProxy(projectFilePath, intermediateOutputPath, project.Configuration.AssumeNotNull(), project.RootNamespace, projectWorkspaceState);
+        var projectHandleProxy = new ProjectSnapshotHandleProxy(projectFilePath, intermediateOutputPath, project.Configuration, project.RootNamespace, projectWorkspaceState);
        return projectHandleProxy;
    }

--- a/src/Razor/test/Microsoft.AspNetCore.Razor.LanguageServer.Test/CodeActions/CodeActionEndToEndTest.NetFx.cs
+++ b/src/Razor/test/Microsoft.AspNetCore.Razor.LanguageServer.Test/CodeActions/CodeActionEndToEndTest.NetFx.cs
@ -1178,7 +1178,7 @@ public class CodeActionEndToEndTest(ITestOutputHelper testOutput) : SingleServer
                return null;
            }

-            var projectWorkspaceState = new ProjectWorkspaceState(_tagHelperDescriptors.ToImmutableArray(), LanguageVersion.Default);
+            var projectWorkspaceState = ProjectWorkspaceState.Create(_tagHelperDescriptors.ToImmutableArray());
            var testDocumentSnapshot = TestDocumentSnapshot.Create(FilePath, CodeDocument.GetSourceText().ToString(), CodeAnalysis.VersionStamp.Default, projectWorkspaceState);
            testDocumentSnapshot.With(CodeDocument);

--- a/src/Razor/test/Microsoft.AspNetCore.Razor.LanguageServer.Test/Completion/TagHelperTooltipFactoryBaseTest.cs
+++ b/src/Razor/test/Microsoft.AspNetCore.Razor.LanguageServer.Test/Completion/TagHelperTooltipFactoryBaseTest.cs
@ -359,7 +359,7 @@ There is no xml, but I got you this < and the >.
        var tagHelperTypeName = "TestNamespace.TestTagHelper";
        builder.Metadata(TypeName(tagHelperTypeName));
        var tagHelpers = ImmutableArray.Create(builder.Build());
-        var projectWorkspaceState = new ProjectWorkspaceState(tagHelpers, CodeAnalysis.CSharp.LanguageVersion.Default);
+        var projectWorkspaceState = ProjectWorkspaceState.Create(tagHelpers);

        var baseDirectory = PathUtilities.CreateRootedPath("path", "to");
        var razorFilePath = Path.Combine(baseDirectory, "file.razor");
@ -383,7 +383,7 @@ There is no xml, but I got you this < and the >.
        var tagHelperTypeName = "TestNamespace.TestTagHelper";
        builder.Metadata(TypeName(tagHelperTypeName));
        var tagHelpers = ImmutableArray.Create(builder.Build());
-        var projectWorkspaceState = new ProjectWorkspaceState(tagHelpers, CodeAnalysis.CSharp.LanguageVersion.Default);
+        var projectWorkspaceState = ProjectWorkspaceState.Create(tagHelpers);

        var baseDirectory = PathUtilities.CreateRootedPath("path", "to");
        var razorFilePath = Path.Combine(baseDirectory, "file.razor");
@ -420,7 +420,7 @@ There is no xml, but I got you this < and the >.
        var tagHelperTypeName = "TestNamespace.TestTagHelper";
        builder.Metadata(TypeName(tagHelperTypeName));
        var tagHelpers = ImmutableArray.Create(builder.Build());
-        var projectWorkspaceState = new ProjectWorkspaceState(tagHelpers, CodeAnalysis.CSharp.LanguageVersion.Default);
+        var projectWorkspaceState = ProjectWorkspaceState.Create(tagHelpers);

        var baseDirectory = PathUtilities.CreateRootedPath("path", "to");
        var razorFilePath = Path.Combine(baseDirectory, "file.razor");
--- a/src/Razor/test/Microsoft.AspNetCore.Razor.LanguageServer.Test/DefaultRazorProjectServiceTest.cs
+++ b/src/Razor/test/Microsoft.AspNetCore.Razor.LanguageServer.Test/DefaultRazorProjectServiceTest.cs
@ -38,7 +38,7 @@ public class DefaultRazorProjectServiceTest(ITestOutputHelper testOutput) : Lang
        var hostProject = new HostProject("C:/path/to/project.csproj", "C:/path/to/obj", RazorConfiguration.Default, "TestRootNamespace");
        projectManager.ProjectAdded(hostProject);
        var projectService = CreateProjectService(new TestSnapshotResolver(), projectManager);
-        var projectWorkspaceState = new ProjectWorkspaceState(ImmutableArray<TagHelperDescriptor>.Empty, LanguageVersion.LatestMajor);
+        var projectWorkspaceState = ProjectWorkspaceState.Create(LanguageVersion.LatestMajor);

        // Act
        await RunOnDispatcherThreadAsync(() =>
--- a/src/Razor/test/Microsoft.AspNetCore.Razor.LanguageServer.Test/Hover/HoverInfoServiceTest.cs
+++ b/src/Razor/test/Microsoft.AspNetCore.Razor.LanguageServer.Test/Hover/HoverInfoServiceTest.cs
@ -975,7 +975,7 @@ public class HoverInfoServiceTest(ITestOutputHelper testOutput) : TagHelperServi
                """;
        var path = "C:/text.razor";
        var codeDocument = CreateCodeDocument(txt, path, DefaultTagHelpers);
-        var projectWorkspaceState = new ProjectWorkspaceState(DefaultTagHelpers, LanguageVersion.Default);
+        var projectWorkspaceState = ProjectWorkspaceState.Create(DefaultTagHelpers);
        var projectSnapshot = TestProjectSnapshot.Create("C:/project.csproj", projectWorkspaceState);
        var sourceText = SourceText.From(txt);

--- a/src/Razor/test/Microsoft.AspNetCore.Razor.LanguageServer.Test/OpenDocumentGeneratorTest.cs
+++ b/src/Razor/test/Microsoft.AspNetCore.Razor.LanguageServer.Test/OpenDocumentGeneratorTest.cs
@ -135,7 +135,7 @@ public class OpenDocumentGeneratorTest : LanguageServerTestBase

            // Act
            projectManager.ProjectWorkspaceStateChanged(_hostProject1.Key,
-                new ProjectWorkspaceState(ImmutableArray<TagHelperDescriptor>.Empty, LanguageVersion.CSharp8));
+                ProjectWorkspaceState.Create(LanguageVersion.CSharp8));
        }, DisposalToken);

        // Assert
@ -162,7 +162,7 @@ public class OpenDocumentGeneratorTest : LanguageServerTestBase

            // Act
            projectManager.ProjectWorkspaceStateChanged(_hostProject1.Key,
-                new ProjectWorkspaceState(ImmutableArray<TagHelperDescriptor>.Empty, LanguageVersion.CSharp8));
+                ProjectWorkspaceState.Create(LanguageVersion.CSharp8));
        }, DisposalToken);

        // Assert
--- a/src/Razor/test/Microsoft.AspNetCore.Razor.LanguageServer.Test/ProjectConfigurationFileChangeEventArgsTest.cs
+++ b/src/Razor/test/Microsoft.AspNetCore.Razor.LanguageServer.Test/ProjectConfigurationFileChangeEventArgsTest.cs
@ -2,6 +2,7 @@
 // Licensed under the MIT license. See License.txt in the project root for license information.

 using System.Collections.Immutable;
+using Microsoft.AspNetCore.Razor.Language;
 using Microsoft.AspNetCore.Razor.LanguageServer.Common;
 using Microsoft.AspNetCore.Razor.LanguageServer.Serialization;
 using Microsoft.AspNetCore.Razor.ProjectSystem;
@ -25,10 +26,10 @@ public class ProjectConfigurationFileChangeEventArgsTest(ITestOutputHelper testO
            .Returns(new RazorProjectInfo(
                "/path/to/obj/project.razor.bin",
                "c:/path/to/project.csproj",
-                configuration: null,
+                configuration: RazorConfiguration.Default,
                rootNamespace: null,
                displayName: "project",
-                projectWorkspaceState: null,
+                projectWorkspaceState: ProjectWorkspaceState.Default,
                documents: ImmutableArray<DocumentSnapshotHandle>.Empty));

        var args = new ProjectConfigurationFileChangeEventArgs(
@ -53,10 +54,10 @@ public class ProjectConfigurationFileChangeEventArgsTest(ITestOutputHelper testO
        var projectInfo = new RazorProjectInfo(
            "/path/to/ORIGINAL/obj/project.razor.bin",
            "c:/path/to/project.csproj",
-            configuration: null,
+            configuration: RazorConfiguration.Default,
            rootNamespace: null,
            displayName: "project",
-            projectWorkspaceState: null,
+            projectWorkspaceState: ProjectWorkspaceState.Default,
            documents: ImmutableArray<DocumentSnapshotHandle>.Empty);

        deserializerMock
@ -84,10 +85,10 @@ public class ProjectConfigurationFileChangeEventArgsTest(ITestOutputHelper testO
        var projectInfo = new RazorProjectInfo(
            "/path/to/obj/project.razor.bin",
            "c:/path/to/project.csproj",
-            configuration: null,
+            configuration: RazorConfiguration.Default,
            rootNamespace: null,
            displayName: "project",
-            projectWorkspaceState: null,
+            projectWorkspaceState: ProjectWorkspaceState.Default,
            documents: ImmutableArray<DocumentSnapshotHandle>.Empty);

        deserializerMock
--- a/src/Razor/test/Microsoft.AspNetCore.Razor.LanguageServer.Test/ProjectConfigurationStateSynchronizerTest.cs
+++ b/src/Razor/test/Microsoft.AspNetCore.Razor.LanguageServer.Test/ProjectConfigurationStateSynchronizerTest.cs
@ -55,7 +55,7 @@ public class ProjectConfigurationStateSynchronizerTest(ITestOutputHelper testOut
            RazorConfiguration.Default,
            rootNamespace: "TestRootNamespace",
            displayName: "project",
-            new ProjectWorkspaceState(ImmutableArray<TagHelperDescriptor>.Empty, LanguageVersion.CSharp5),
+            ProjectWorkspaceState.Create(LanguageVersion.CSharp5),
            ImmutableArray<DocumentSnapshotHandle>.Empty);
        var intermediateOutputPath = Path.GetDirectoryName(FilePathNormalizer.Normalize(projectInfo.SerializedFilePath));
        var projectKey = TestProjectKey.Create(intermediateOutputPath);
@ -148,7 +148,7 @@ public class ProjectConfigurationStateSynchronizerTest(ITestOutputHelper testOut
            RazorConfiguration.Default,
            rootNamespace: "TestRootNamespace",
            displayName: "project",
-            new ProjectWorkspaceState(ImmutableArray<TagHelperDescriptor>.Empty, LanguageVersion.CSharp5),
+            ProjectWorkspaceState.Create(LanguageVersion.CSharp5),
            ImmutableArray<DocumentSnapshotHandle>.Empty);
        var intermediateOutputPath = Path.GetDirectoryName(FilePathNormalizer.Normalize(projectInfo.SerializedFilePath));
        var projectKey = TestProjectKey.Create(intermediateOutputPath);
@ -196,7 +196,7 @@ public class ProjectConfigurationStateSynchronizerTest(ITestOutputHelper testOut
            RazorConfiguration.Default,
            rootNamespace: "TestRootNamespace",
            displayName: "project",
-            new ProjectWorkspaceState(ImmutableArray<TagHelperDescriptor>.Empty, LanguageVersion.CSharp5),
+            ProjectWorkspaceState.Create(LanguageVersion.CSharp5),
            ImmutableArray<DocumentSnapshotHandle>.Empty);
        var intermediateOutputPath = Path.GetDirectoryName(FilePathNormalizer.Normalize(projectInfo.SerializedFilePath));
        var projectKey = TestProjectKey.Create(intermediateOutputPath);
@ -264,7 +264,7 @@ public class ProjectConfigurationStateSynchronizerTest(ITestOutputHelper testOut
            RazorConfiguration.Default,
            rootNamespace: "TestRootNamespace",
            displayName: "project",
-            new ProjectWorkspaceState(ImmutableArray<TagHelperDescriptor>.Empty, LanguageVersion.CSharp5),
+            ProjectWorkspaceState.Create(LanguageVersion.CSharp5),
            ImmutableArray<DocumentSnapshotHandle>.Empty);
        var intermediateOutputPath = Path.GetDirectoryName(FilePathNormalizer.Normalize(initialProjectInfo.SerializedFilePath));
        var projectKey = TestProjectKey.Create(intermediateOutputPath);
@ -295,7 +295,7 @@ public class ProjectConfigurationStateSynchronizerTest(ITestOutputHelper testOut
                Array.Empty<RazorExtension>()),
            rootNamespace: "TestRootNamespace2",
            displayName: "project",
-            new ProjectWorkspaceState(ImmutableArray<TagHelperDescriptor>.Empty, LanguageVersion.CSharp6),
+            ProjectWorkspaceState.Create(LanguageVersion.CSharp6),
            ImmutableArray<DocumentSnapshotHandle>.Empty);
        projectService
            .Setup(service => service.UpdateProject(
@ -348,7 +348,7 @@ public class ProjectConfigurationStateSynchronizerTest(ITestOutputHelper testOut
            RazorConfiguration.Default,
            rootNamespace: "TestRootNamespace",
            displayName: "project",
-            new ProjectWorkspaceState(ImmutableArray<TagHelperDescriptor>.Empty, LanguageVersion.CSharp5),
+            ProjectWorkspaceState.Create(LanguageVersion.CSharp5),
            ImmutableArray<DocumentSnapshotHandle>.Empty);
        var intermediateOutputPath = Path.GetDirectoryName(FilePathNormalizer.Normalize(initialProjectInfo.SerializedFilePath));
        var projectKey = TestProjectKey.Create(intermediateOutputPath);
@ -379,7 +379,7 @@ public class ProjectConfigurationStateSynchronizerTest(ITestOutputHelper testOut
                Array.Empty<RazorExtension>()),
            rootNamespace: "TestRootNamespace2",
            displayName: "project",
-            new ProjectWorkspaceState(ImmutableArray<TagHelperDescriptor>.Empty, LanguageVersion.CSharp6),
+            ProjectWorkspaceState.Create(LanguageVersion.CSharp6),
            ImmutableArray<DocumentSnapshotHandle>.Empty);

        // This is the request that happens when the server is reset
@ -463,7 +463,7 @@ public class ProjectConfigurationStateSynchronizerTest(ITestOutputHelper testOut
            RazorConfiguration.Default,
            rootNamespace: "TestRootNamespace",
            displayName: "project",
-            new ProjectWorkspaceState(ImmutableArray<TagHelperDescriptor>.Empty, LanguageVersion.CSharp5),
+            ProjectWorkspaceState.Create(LanguageVersion.CSharp5),
            ImmutableArray<DocumentSnapshotHandle>.Empty);
        var intermediateOutputPath = Path.GetDirectoryName(FilePathNormalizer.Normalize(projectInfo.SerializedFilePath));
        var projectKey = TestProjectKey.Create(intermediateOutputPath);
--- a/src/Razor/test/Microsoft.AspNetCore.Razor.LanguageServer.Test/Refactoring/RenameEndpointTest.cs
+++ b/src/Razor/test/Microsoft.AspNetCore.Razor.LanguageServer.Test/Refactoring/RenameEndpointTest.cs
@ -609,7 +609,7 @@ public class RenameEndpointTest : LanguageServerTestBase
        namespaceNode.Content = rootNamespaceName;

        var sourceText = SourceText.From(item.Content);
-        var projectWorkspaceState = new ProjectWorkspaceState(tagHelpers, LanguageVersion.Default);
+        var projectWorkspaceState = ProjectWorkspaceState.Create(tagHelpers);
        var projectSnapshot = TestProjectSnapshot.Create("C:/project.csproj", projectWorkspaceState);
        var snapshot = Mock.Of<IDocumentSnapshot>(d =>
            d.GetGeneratedOutputAsync() == Task.FromResult(codeDocument) &&
--- a/src/Razor/test/Microsoft.AspNetCore.Razor.ProjectEngineHost.Test/Serialization/ProjectSnapshotHandleSerializationTest.cs
+++ b/src/Razor/test/Microsoft.AspNetCore.Razor.ProjectEngineHost.Test/Serialization/ProjectSnapshotHandleSerializationTest.cs
@ -62,7 +62,7 @@ public class ProjectSnapshotHandleSerializationTest(ITestOutputHelper testOutput
    {
        // Arrange
        var projectId = ProjectId.CreateNewId();
-        var expectedSnapshot = new ProjectSnapshotHandle(projectId, null, null);
+        var expectedSnapshot = new ProjectSnapshotHandle(projectId, RazorConfiguration.Default, null);

        // Act
        var bytes = MessagePackConvert.Serialize(expectedSnapshot, s_options);
@ -71,7 +71,7 @@ public class ProjectSnapshotHandleSerializationTest(ITestOutputHelper testOutput
        // Assert
        Assert.NotNull(actualSnapshot);
        Assert.Equal(expectedSnapshot.ProjectId, actualSnapshot.ProjectId);
-        Assert.Null(actualSnapshot.Configuration);
+        Assert.NotNull(actualSnapshot.Configuration);
        Assert.Null(actualSnapshot.RootNamespace);
    }
 }
--- a/src/Razor/test/Microsoft.AspNetCore.Razor.ProjectEngineHost.Test/SerializationTest.cs
+++ b/src/Razor/test/Microsoft.AspNetCore.Razor.ProjectEngineHost.Test/SerializationTest.cs
@ -30,7 +30,7 @@ public class SerializationTest : ToolingTestBase
        };

        _configuration = RazorConfiguration.Create(languageVersion, "Custom", extensions);
-        _projectWorkspaceState = new ProjectWorkspaceState(ImmutableArray.Create(
+        _projectWorkspaceState = ProjectWorkspaceState.Create(ImmutableArray.Create(
            TagHelperDescriptorBuilder.Create("Test", "TestAssembly").Build()),
            csharpLanguageVersion: LanguageVersion.LatestMajor);
    }
--- a/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common.Tooling/LanguageServer/TestDocumentSnapshot.cs
+++ b/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common.Tooling/LanguageServer/TestDocumentSnapshot.cs
@ -7,7 +7,6 @@ using System.IO;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Razor.Language;
 using Microsoft.AspNetCore.Razor.ProjectSystem;
-using Microsoft.AspNetCore.Razor.Test.Common.Workspaces;
 using Microsoft.AspNetCore.Razor.Utilities;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.Razor.ProjectSystem;
@ -33,8 +32,6 @@ internal class TestDocumentSnapshot : DocumentSnapshot

    public static TestDocumentSnapshot Create(string filePath, string text, VersionStamp version, TestProjectSnapshot projectSnapshot)
    {
-        using var testWorkspace = TestWorkspace.Create();
-
        var targetPath = Path.GetDirectoryName(projectSnapshot.FilePath) is string projectDirectory && filePath.StartsWith(projectDirectory)
            ? filePath[projectDirectory.Length..]
            : filePath;
@ -42,7 +39,6 @@ internal class TestDocumentSnapshot : DocumentSnapshot
        var hostDocument = new HostDocument(filePath, targetPath);
        var sourceText = SourceText.From(text);
        var documentState = new DocumentState(
-            testWorkspace.Services,
            hostDocument,
            SourceText.From(text),
            version,
@ -52,7 +48,7 @@ internal class TestDocumentSnapshot : DocumentSnapshot
        return testDocument;
    }

-    internal static TestDocumentSnapshot Create(Workspace workspace, ProjectSnapshot projectSnapshot, string filePath, string text = "", VersionStamp? version = null)
+    internal static TestDocumentSnapshot Create(ProjectSnapshot projectSnapshot, string filePath, string text = "", VersionStamp? version = null)
    {
        version ??= VersionStamp.Default;

@ -66,7 +62,6 @@ internal class TestDocumentSnapshot : DocumentSnapshot
        var hostDocument = new HostDocument(filePath, targetPath);
        var sourceText = SourceText.From(text);
        var documentState = new DocumentState(
-            workspace.Services,
            hostDocument,
            SourceText.From(text),
            version,
--- a/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common.Tooling/LanguageServer/TestProjectSnapshot.cs
+++ b/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common.Tooling/LanguageServer/TestProjectSnapshot.cs
@ -2,14 +2,11 @@
 // Licensed under the MIT license. See License.txt in the project root for license information.

 using System;
-using System.Collections.Generic;
 using System.IO;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Razor.Language;
 using Microsoft.AspNetCore.Razor.ProjectSystem;
-using Microsoft.AspNetCore.Razor.Test.Common.Workspaces;
 using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.Host;
 using Microsoft.CodeAnalysis.Razor.ProjectSystem;
 using Microsoft.CodeAnalysis.Text;

@ -28,31 +25,19 @@ internal class TestProjectSnapshot : ProjectSnapshot
        string intermediateOutputPath,
        string[] documentFilePaths,
        RazorConfiguration configuration,
-        ProjectWorkspaceState? projectWorkspaceState,
+        ProjectWorkspaceState? projectWorkspaceState = null,
        string? displayName = null)
    {
-        var workspaceServices = new List<IWorkspaceService>()
-        {
-            new TestProjectSnapshotProjectEngineFactory(),
-        };
-
-        var languageServices = new List<ILanguageService>();
-
-        var hostServices = TestServices.Create(workspaceServices, languageServices);
-        using var workspace = TestWorkspace.Create(hostServices);
+        var projectEngineFactory = new TestProjectSnapshotProjectEngineFactory();
        var hostProject = new HostProject(filePath, intermediateOutputPath, configuration, "TestRootNamespace", displayName);
-        var state = ProjectState.Create(workspace.Services, hostProject);
+        var state = ProjectState.Create(projectEngineFactory, hostProject, projectWorkspaceState ?? ProjectWorkspaceState.Default);
+
        foreach (var documentFilePath in documentFilePaths)
        {
            var hostDocument = new HostDocument(documentFilePath, documentFilePath);
            state = state.WithAddedHostDocument(hostDocument, () => Task.FromResult(TextAndVersion.Create(SourceText.From(string.Empty), VersionStamp.Default)));
        }

-        if (projectWorkspaceState is not null)
-        {
-            state = state.WithProjectWorkspaceState(projectWorkspaceState);
-        }
-
        var testProject = new TestProjectSnapshot(state);

        return testProject;
--- a/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common.Tooling/LanguageServer/TestProjectSnapshotManager.cs
+++ b/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common.Tooling/LanguageServer/TestProjectSnapshotManager.cs
@ -38,7 +38,7 @@ internal class TestProjectSnapshotManager : DefaultProjectSnapshotManager

    public TestDocumentSnapshot CreateAndAddDocument(ProjectSnapshot projectSnapshot, string filePath)
    {
-        var documentSnapshot = TestDocumentSnapshot.Create(Workspace, projectSnapshot, filePath);
+        var documentSnapshot = TestDocumentSnapshot.Create(projectSnapshot, filePath);
        DocumentAdded(projectSnapshot.Key, documentSnapshot.HostDocument, new DocumentSnapshotTextLoader(documentSnapshot));

        return documentSnapshot;
--- a/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common.Tooling/Workspaces/DocumentExcerptServiceTestBase.cs
+++ b/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common.Tooling/Workspaces/DocumentExcerptServiceTestBase.cs
@ -6,6 +6,7 @@ using System.IO;
 using System.Linq;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Razor.Language;
+using Microsoft.AspNetCore.Razor.ProjectSystem;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.Razor.ProjectSystem;
 using Microsoft.CodeAnalysis.Text;
@ -40,7 +41,7 @@ public abstract class DocumentExcerptServiceTestBase(ITestOutputHelper testOutpu
    private (IDocumentSnapshot primary, Document secondary) InitializeDocument(SourceText sourceText)
    {
        var project = new ProjectSnapshot(
-            ProjectState.Create(Workspace.Services, _hostProject)
+            ProjectState.Create(ProjectEngineFactory, _hostProject, ProjectWorkspaceState.Default)
            .WithAddedHostDocument(_hostDocument, () => Task.FromResult(TextAndVersion.Create(sourceText, VersionStamp.Create()))));

        var primary = project.GetDocument(_hostDocument.FilePath).AssumeNotNull();
--- a/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common.Tooling/Workspaces/WorkspaceTestBase.cs
+++ b/src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common.Tooling/Workspaces/WorkspaceTestBase.cs
@ -7,6 +7,7 @@ using Microsoft.AspNetCore.Razor.Language;
 using Microsoft.AspNetCore.Razor.Test.Common.ProjectSystem;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.Host;
+using Microsoft.CodeAnalysis.Razor;
 using Xunit.Abstractions;

 namespace Microsoft.AspNetCore.Razor.Test.Common.Workspaces;
@ -16,6 +17,7 @@ public abstract class WorkspaceTestBase : ToolingTestBase
    private bool _initialized;
    private HostServices? _hostServices;
    private Workspace? _workspace;
+    private ProjectSnapshotProjectEngineFactory? _projectEngineFactory;

    protected WorkspaceTestBase(ITestOutputHelper testOutput)
        : base(testOutput)
@ -40,6 +42,15 @@ public abstract class WorkspaceTestBase : ToolingTestBase
        }
    }

+    private protected ProjectSnapshotProjectEngineFactory ProjectEngineFactory
+    {
+        get
+        {
+            EnsureInitialized();
+            return _projectEngineFactory;
+        }
+    }
+
    protected virtual void ConfigureWorkspaceServices(List<IWorkspaceService> services)
    {
    }
@ -56,22 +67,25 @@ public abstract class WorkspaceTestBase : ToolingTestBase
    {
    }

-    [MemberNotNull(nameof(_hostServices), nameof(_workspace))]
+    [MemberNotNull(nameof(_hostServices), nameof(_workspace), nameof(_projectEngineFactory))]
    private void EnsureInitialized()
    {
        if (_initialized)
        {
            _hostServices.AssumeNotNull();
            _workspace.AssumeNotNull();
+            _projectEngineFactory.AssumeNotNull();
            return;
        }

+        _projectEngineFactory = new TestProjectSnapshotProjectEngineFactory()
+        {
+            Configure = ConfigureProjectEngine,
+        };
+
        var workspaceServices = new List<IWorkspaceService>()
        {
-            new TestProjectSnapshotProjectEngineFactory()
-            {
-                Configure = ConfigureProjectEngine,
-            },
+            _projectEngineFactory,
        };
        ConfigureWorkspaceServices(workspaceServices);

--- a/src/Razor/test/Microsoft.CodeAnalysis.Razor.Workspaces.Test/ProjectSystem/DefaultDocumentSnapshotTest.cs
+++ b/src/Razor/test/Microsoft.CodeAnalysis.Razor.Workspaces.Test/ProjectSystem/DefaultDocumentSnapshotTest.cs
@ -6,6 +6,7 @@
 using System;
 using System.Collections.Generic;
 using System.Threading.Tasks;
+using Microsoft.AspNetCore.Razor.ProjectSystem;
 using Microsoft.AspNetCore.Razor.Test.Common;
 using Microsoft.AspNetCore.Razor.Test.Common.Workspaces;
 using Microsoft.CodeAnalysis.Host;
@ -41,21 +42,21 @@ public class DefaultDocumentSnapshotTest : WorkspaceTestBase
        _legacyHostDocument = new HostDocument(TestProjectData.SomeProjectFile1);
        _nestedComponentHostDocument = new HostDocument(TestProjectData.SomeProjectNestedComponentFile3);

-        var projectState = ProjectState.Create(Workspace.Services, TestProjectData.SomeProject);
+        var projectState = ProjectState.Create(ProjectEngineFactory, TestProjectData.SomeProject, ProjectWorkspaceState.Default);
        var project = new ProjectSnapshot(projectState);

        var textAndVersion = TextAndVersion.Create(_sourceText, _version);

-        var documentState = DocumentState.Create(Workspace.Services, _legacyHostDocument, () => Task.FromResult(textAndVersion));
+        var documentState = DocumentState.Create(_legacyHostDocument, () => Task.FromResult(textAndVersion));
        _legacyDocument = new DocumentSnapshot(project, documentState);

-        documentState = DocumentState.Create(Workspace.Services, _componentHostDocument, () => Task.FromResult(textAndVersion));
+        documentState = DocumentState.Create(_componentHostDocument, () => Task.FromResult(textAndVersion));
        _componentDocument = new DocumentSnapshot(project, documentState);

-        documentState = DocumentState.Create(Workspace.Services, _componentCshtmlHostDocument, () => Task.FromResult(textAndVersion));
+        documentState = DocumentState.Create(_componentCshtmlHostDocument, () => Task.FromResult(textAndVersion));
        _componentCshtmlDocument = new DocumentSnapshot(project, documentState);

-        documentState = DocumentState.Create(Workspace.Services, _nestedComponentHostDocument, () => Task.FromResult(textAndVersion));
+        documentState = DocumentState.Create(_nestedComponentHostDocument, () => Task.FromResult(textAndVersion));
        _nestedComponentDocument = new DocumentSnapshot(project, documentState);
    }

--- a/src/Razor/test/Microsoft.CodeAnalysis.Razor.Workspaces.Test/ProjectSystem/DefaultProjectSnapshotTest.cs
+++ b/src/Razor/test/Microsoft.CodeAnalysis.Razor.Workspaces.Test/ProjectSystem/DefaultProjectSnapshotTest.cs
@ -29,9 +29,8 @@ public class DefaultProjectSnapshotTest : WorkspaceTestBase
        _tagHelperResolver = new TestTagHelperResolver();

        _hostProject = new HostProject(TestProjectData.SomeProject.FilePath, TestProjectData.SomeProject.IntermediateOutputPath, FallbackRazorConfiguration.MVC_2_0, TestProjectData.SomeProject.RootNamespace);
-        _projectWorkspaceState = new ProjectWorkspaceState(ImmutableArray.Create(
-            TagHelperDescriptorBuilder.Create("TestTagHelper", "TestAssembly").Build()),
-            csharpLanguageVersion: default);
+        _projectWorkspaceState = ProjectWorkspaceState.Create(ImmutableArray.Create(
+            TagHelperDescriptorBuilder.Create("TestTagHelper", "TestAssembly").Build()));

        _documents =
        [
@ -57,7 +56,7 @@ public class DefaultProjectSnapshotTest : WorkspaceTestBase
    public void ProjectSnapshot_CachesDocumentSnapshots()
    {
        // Arrange
-        var state = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState)
+        var state = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState)
            .WithAddedHostDocument(_documents[0], DocumentState.EmptyLoader)
            .WithAddedHostDocument(_documents[1], DocumentState.EmptyLoader)
            .WithAddedHostDocument(_documents[2], DocumentState.EmptyLoader);
@ -78,7 +77,7 @@ public class DefaultProjectSnapshotTest : WorkspaceTestBase
    public void IsImportDocument_NonImportDocument_ReturnsFalse()
    {
        // Arrange
-        var state = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState)
+        var state = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState)
            .WithAddedHostDocument(_documents[0], DocumentState.EmptyLoader);
        var snapshot = new ProjectSnapshot(state);

@ -95,7 +94,7 @@ public class DefaultProjectSnapshotTest : WorkspaceTestBase
    public void IsImportDocument_ImportDocument_ReturnsTrue()
    {
        // Arrange
-        var state = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState)
+        var state = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState)
            .WithAddedHostDocument(_documents[0], DocumentState.EmptyLoader)
            .WithAddedHostDocument(TestProjectData.SomeProjectImportFile, DocumentState.EmptyLoader);
        var snapshot = new ProjectSnapshot(state);
@ -113,7 +112,7 @@ public class DefaultProjectSnapshotTest : WorkspaceTestBase
    public void GetRelatedDocuments_NonImportDocument_ReturnsEmpty()
    {
        // Arrange
-        var state = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState)
+        var state = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState)
            .WithAddedHostDocument(_documents[0], DocumentState.EmptyLoader);
        var snapshot = new ProjectSnapshot(state);

@ -130,7 +129,7 @@ public class DefaultProjectSnapshotTest : WorkspaceTestBase
    public void GetRelatedDocuments_ImportDocument_ReturnsRelated()
    {
        // Arrange
-        var state = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState)
+        var state = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState)
            .WithAddedHostDocument(_documents[0], DocumentState.EmptyLoader)
            .WithAddedHostDocument(_documents[1], DocumentState.EmptyLoader)
            .WithAddedHostDocument(TestProjectData.SomeProjectImportFile, DocumentState.EmptyLoader);
--- a/src/Razor/test/Microsoft.CodeAnalysis.Razor.Workspaces.Test/ProjectSystem/DocumentStateTest.cs
+++ b/src/Razor/test/Microsoft.CodeAnalysis.Razor.Workspaces.Test/ProjectSystem/DocumentStateTest.cs
@ -1,60 +1,34 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the MIT license. See License.txt in the project root for license information.

-#nullable disable
-
 using System;
-using System.Collections.Generic;
-using System.Collections.Immutable;
 using System.Threading.Tasks;
-using Microsoft.AspNetCore.Razor.Language;
-using Microsoft.AspNetCore.Razor.ProjectSystem;
 using Microsoft.AspNetCore.Razor.Test.Common;
-using Microsoft.AspNetCore.Razor.Test.Common.Workspaces;
-using Microsoft.CodeAnalysis.Host;
 using Microsoft.CodeAnalysis.Text;
 using Xunit;
 using Xunit.Abstractions;

 namespace Microsoft.CodeAnalysis.Razor.ProjectSystem;

-public class DocumentStateTest : WorkspaceTestBase
+public class DocumentStateTest : ToolingTestBase
 {
    private readonly HostDocument _hostDocument;
-    private readonly HostProject _hostProject;
-    private readonly HostProject _hostProjectWithConfigurationChange;
-    private readonly ProjectWorkspaceState _projectWorkspaceState;
-    private readonly TestTagHelperResolver _tagHelperResolver;
    private readonly Func<Task<TextAndVersion>> _textLoader;
    private readonly SourceText _text;

    public DocumentStateTest(ITestOutputHelper testOutput)
        : base(testOutput)
    {
-        _tagHelperResolver = new TestTagHelperResolver();
-
-        _hostProject = new HostProject(TestProjectData.SomeProject.FilePath, TestProjectData.SomeProject.IntermediateOutputPath, FallbackRazorConfiguration.MVC_2_0, TestProjectData.SomeProject.RootNamespace);
-        _hostProjectWithConfigurationChange = new HostProject(TestProjectData.SomeProject.FilePath, TestProjectData.SomeProject.IntermediateOutputPath, FallbackRazorConfiguration.MVC_1_0, TestProjectData.SomeProject.RootNamespace);
-        _projectWorkspaceState = new ProjectWorkspaceState(ImmutableArray.Create(
-            TagHelperDescriptorBuilder.Create("TestTagHelper", "TestAssembly").Build()),
-            csharpLanguageVersion: default);
-
        _hostDocument = TestProjectData.SomeProjectFile1;
-
        _text = SourceText.From("Hello, world!");
        _textLoader = () => Task.FromResult(TextAndVersion.Create(_text, VersionStamp.Create()));
    }

-    protected override void ConfigureWorkspaceServices(List<IWorkspaceService> services)
-    {
-        services.Add(_tagHelperResolver);
-    }
-
    [Fact]
    public async Task DocumentState_CreatedNew_HasEmptyText()
    {
        // Arrange & Act
-        var state = DocumentState.Create(Workspace.Services, _hostDocument, DocumentState.EmptyLoader);
+        var state = DocumentState.Create(_hostDocument, DocumentState.EmptyLoader);

        // Assert
        var text = await state.GetTextAsync();
@ -65,7 +39,7 @@ public class DocumentStateTest : WorkspaceTestBase
    public async Task DocumentState_WithText_CreatesNewState()
    {
        // Arrange
-        var original = DocumentState.Create(Workspace.Services, _hostDocument, DocumentState.EmptyLoader);
+        var original = DocumentState.Create(_hostDocument, DocumentState.EmptyLoader);

        // Act
        var state = original.WithText(_text, VersionStamp.Create());
@ -79,7 +53,7 @@ public class DocumentStateTest : WorkspaceTestBase
    public async Task DocumentState_WithTextLoader_CreatesNewState()
    {
        // Arrange
-        var original = DocumentState.Create(Workspace.Services, _hostDocument, DocumentState.EmptyLoader);
+        var original = DocumentState.Create(_hostDocument, DocumentState.EmptyLoader);

        // Act
        var state = original.WithTextLoader(_textLoader);
@ -93,7 +67,7 @@ public class DocumentStateTest : WorkspaceTestBase
    public void DocumentState_WithConfigurationChange_CachesSnapshotText()
    {
        // Arrange
-        var original = DocumentState.Create(Workspace.Services, _hostDocument, DocumentState.EmptyLoader)
+        var original = DocumentState.Create(_hostDocument, DocumentState.EmptyLoader)
            .WithText(_text, VersionStamp.Create());

        // Act
@ -108,7 +82,7 @@ public class DocumentStateTest : WorkspaceTestBase
    public async Task DocumentState_WithConfigurationChange_CachesLoadedText()
    {
        // Arrange
-        var original = DocumentState.Create(Workspace.Services, _hostDocument, DocumentState.EmptyLoader)
+        var original = DocumentState.Create(_hostDocument, DocumentState.EmptyLoader)
            .WithTextLoader(_textLoader);

        await original.GetTextAsync();
@ -125,7 +99,7 @@ public class DocumentStateTest : WorkspaceTestBase
    public void DocumentState_WithImportsChange_CachesSnapshotText()
    {
        // Arrange
-        var original = DocumentState.Create(Workspace.Services, _hostDocument, DocumentState.EmptyLoader)
+        var original = DocumentState.Create(_hostDocument, DocumentState.EmptyLoader)
            .WithText(_text, VersionStamp.Create());

        // Act
@ -140,7 +114,7 @@ public class DocumentStateTest : WorkspaceTestBase
    public async Task DocumentState_WithImportsChange_CachesLoadedText()
    {
        // Arrange
-        var original = DocumentState.Create(Workspace.Services, _hostDocument, DocumentState.EmptyLoader)
+        var original = DocumentState.Create(_hostDocument, DocumentState.EmptyLoader)
            .WithTextLoader(_textLoader);

        await original.GetTextAsync();
@ -157,7 +131,7 @@ public class DocumentStateTest : WorkspaceTestBase
    public void DocumentState_WithProjectWorkspaceStateChange_CachesSnapshotText()
    {
        // Arrange
-        var original = DocumentState.Create(Workspace.Services, _hostDocument, DocumentState.EmptyLoader)
+        var original = DocumentState.Create(_hostDocument, DocumentState.EmptyLoader)
            .WithText(_text, VersionStamp.Create());

        // Act
@ -172,7 +146,7 @@ public class DocumentStateTest : WorkspaceTestBase
    public async Task DocumentState_WithProjectWorkspaceStateChange_CachesLoadedText()
    {
        // Arrange
-        var original = DocumentState.Create(Workspace.Services, _hostDocument, DocumentState.EmptyLoader)
+        var original = DocumentState.Create(_hostDocument, DocumentState.EmptyLoader)
            .WithTextLoader(_textLoader);

        await original.GetTextAsync();
--- a/src/Razor/test/Microsoft.CodeAnalysis.Razor.Workspaces.Test/ProjectSystem/GeneratedDocumentTextLoaderTest.cs
+++ b/src/Razor/test/Microsoft.CodeAnalysis.Razor.Workspaces.Test/ProjectSystem/GeneratedDocumentTextLoaderTest.cs
@ -5,6 +5,7 @@

 using System.Text;
 using System.Threading.Tasks;
+using Microsoft.AspNetCore.Razor.ProjectSystem;
 using Microsoft.AspNetCore.Razor.Test.Common;
 using Microsoft.AspNetCore.Razor.Test.Common.Workspaces;
 using Microsoft.CodeAnalysis.Text;
@ -30,7 +31,7 @@ public class GeneratedDocumentTextLoaderTest : WorkspaceTestBase
    {
        // Arrange
        var project = new ProjectSnapshot(
-            ProjectState.Create(Workspace.Services, _hostProject)
+            ProjectState.Create(ProjectEngineFactory, _hostProject, ProjectWorkspaceState.Default)
            .WithAddedHostDocument(_hostDocument, () => Task.FromResult(TextAndVersion.Create(SourceText.From(""), VersionStamp.Create()))));

        var document = project.GetDocument(_hostDocument.FilePath);
--- a/src/Razor/test/Microsoft.CodeAnalysis.Razor.Workspaces.Test/ProjectSystem/ProjectStateGeneratedOutputTest.cs
+++ b/src/Razor/test/Microsoft.CodeAnalysis.Razor.Workspaces.Test/ProjectSystem/ProjectStateGeneratedOutputTest.cs
@ -58,7 +58,7 @@ public class ProjectStateGeneratedOutputTest : WorkspaceTestBase
    {
        // Arrange
        var original =
-            ProjectState.Create(Workspace.Services, _hostProject)
+            ProjectState.Create(ProjectEngineFactory, _hostProject, ProjectWorkspaceState.Default)
            .WithAddedHostDocument(_hostDocument, DocumentState.EmptyLoader);

        var (originalOutput, originalInputVersion) = await GetOutputAsync(original, _hostDocument);
@ -77,7 +77,7 @@ public class ProjectStateGeneratedOutputTest : WorkspaceTestBase
    {
        // Arrange
        var original =
-            ProjectState.Create(Workspace.Services, _hostProject)
+            ProjectState.Create(ProjectEngineFactory, _hostProject, ProjectWorkspaceState.Default)
            .WithAddedHostDocument(_hostDocument, DocumentState.EmptyLoader);

        var (originalOutput, originalInputVersion) = await GetOutputAsync(original, _hostDocument);
@ -97,7 +97,7 @@ public class ProjectStateGeneratedOutputTest : WorkspaceTestBase
    {
        // Arrange
        var original =
-            ProjectState.Create(Workspace.Services, _hostProject)
+            ProjectState.Create(ProjectEngineFactory, _hostProject, ProjectWorkspaceState.Default)
            .WithAddedHostDocument(_hostDocument, DocumentState.EmptyLoader)
            .WithAddedHostDocument(TestProjectData.SomeProjectImportFile, DocumentState.EmptyLoader);

@ -119,7 +119,7 @@ public class ProjectStateGeneratedOutputTest : WorkspaceTestBase
    {
        // Arrange
        var original =
-            ProjectState.Create(Workspace.Services, _hostProject)
+            ProjectState.Create(ProjectEngineFactory, _hostProject, ProjectWorkspaceState.Default)
            .WithAddedHostDocument(_hostDocument, DocumentState.EmptyLoader)
            .WithAddedHostDocument(TestProjectData.SomeProjectImportFile, DocumentState.EmptyLoader);

@ -141,7 +141,7 @@ public class ProjectStateGeneratedOutputTest : WorkspaceTestBase
    {
        // Arrange
        var original =
-            ProjectState.Create(Workspace.Services, _hostProject)
+            ProjectState.Create(ProjectEngineFactory, _hostProject, ProjectWorkspaceState.Default)
            .WithAddedHostDocument(_hostDocument, DocumentState.EmptyLoader)
            .WithAddedHostDocument(TestProjectData.SomeProjectImportFile, DocumentState.EmptyLoader);

@ -162,12 +162,11 @@ public class ProjectStateGeneratedOutputTest : WorkspaceTestBase
    {
        // Arrange
        var original =
-            ProjectState.Create(Workspace.Services, _hostProject)
-            .WithAddedHostDocument(_hostDocument, DocumentState.EmptyLoader)
-            .WithProjectWorkspaceState(ProjectWorkspaceState.Default);
+            ProjectState.Create(ProjectEngineFactory, _hostProject, ProjectWorkspaceState.Default)
+            .WithAddedHostDocument(_hostDocument, DocumentState.EmptyLoader);

        var (originalOutput, originalInputVersion) = await GetOutputAsync(original, _hostDocument);
-        var changed = new ProjectWorkspaceState(ImmutableArray<TagHelperDescriptor>.Empty, csharpLanguageVersion: default);
+        var changed = ProjectWorkspaceState.Default;

        // Act
        var state = original.WithProjectWorkspaceState(changed);
@ -176,7 +175,6 @@ public class ProjectStateGeneratedOutputTest : WorkspaceTestBase
        var (actualOutput, actualInputVersion) = await GetOutputAsync(state, _hostDocument);
        Assert.Same(originalOutput, actualOutput);
        Assert.Equal(originalInputVersion, actualInputVersion);
-        Assert.Equal(state.ProjectWorkspaceStateVersion, actualInputVersion);
    }

    // The generated code's text doesn't change as a result, so the output version does not change
@ -185,11 +183,11 @@ public class ProjectStateGeneratedOutputTest : WorkspaceTestBase
    {
        // Arrange
        var original =
-            ProjectState.Create(Workspace.Services, _hostProject)
+            ProjectState.Create(ProjectEngineFactory, _hostProject, ProjectWorkspaceState.Default)
            .WithAddedHostDocument(_hostDocument, DocumentState.EmptyLoader);

        var (originalOutput, originalInputVersion) = await GetOutputAsync(original, _hostDocument);
-        var changed = new ProjectWorkspaceState(_someTagHelpers, default);
+        var changed = ProjectWorkspaceState.Create(_someTagHelpers);

        // Act
        var state = original.WithProjectWorkspaceState(changed);
@ -207,11 +205,11 @@ public class ProjectStateGeneratedOutputTest : WorkspaceTestBase
        // Arrange
        var csharp8ValidConfiguration = RazorConfiguration.Create(RazorLanguageVersion.Version_3_0, _hostProject.Configuration.ConfigurationName, _hostProject.Configuration.Extensions);
        var hostProject = new HostProject(TestProjectData.SomeProject.FilePath, TestProjectData.SomeProject.IntermediateOutputPath, csharp8ValidConfiguration, TestProjectData.SomeProject.RootNamespace);
-        var originalWorkspaceState = new ProjectWorkspaceState(_someTagHelpers, LanguageVersion.CSharp7);
+        var originalWorkspaceState = ProjectWorkspaceState.Create(_someTagHelpers, LanguageVersion.CSharp7);
        var original =
-            ProjectState.Create(Workspace.Services, hostProject, originalWorkspaceState)
+            ProjectState.Create(ProjectEngineFactory, hostProject, originalWorkspaceState)
            .WithAddedHostDocument(_hostDocument, () => Task.FromResult(TextAndVersion.Create(SourceText.From("@DateTime.Now"), VersionStamp.Default)));
-        var changedWorkspaceState = new ProjectWorkspaceState(_someTagHelpers, LanguageVersion.CSharp8);
+        var changedWorkspaceState = ProjectWorkspaceState.Create(_someTagHelpers, LanguageVersion.CSharp8);

        var (originalOutput, originalInputVersion) = await GetOutputAsync(original, _hostDocument);

@ -230,7 +228,7 @@ public class ProjectStateGeneratedOutputTest : WorkspaceTestBase
    {
        // Arrange
        var original =
-            ProjectState.Create(Workspace.Services, _hostProject)
+            ProjectState.Create(ProjectEngineFactory, _hostProject, ProjectWorkspaceState.Default)
            .WithAddedHostDocument(_hostDocument, DocumentState.EmptyLoader);

        var (originalOutput, originalInputVersion) = await GetOutputAsync(original, _hostDocument);
--- a/src/Razor/test/Microsoft.CodeAnalysis.Razor.Workspaces.Test/ProjectSystem/ProjectStateTest.cs
+++ b/src/Razor/test/Microsoft.CodeAnalysis.Razor.Workspaces.Test/ProjectSystem/ProjectStateTest.cs
@ -1,11 +1,10 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the MIT license. See License.txt in the project root for license information.

-#nullable disable
-
 using System;
 using System.Collections.Generic;
 using System.Collections.Immutable;
+using System.Diagnostics.CodeAnalysis;
 using System.Linq;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Razor.Language;
@ -26,20 +25,21 @@ public class ProjectStateTest : WorkspaceTestBase
    private readonly HostProject _hostProject;
    private readonly HostProject _hostProjectWithConfigurationChange;
    private readonly ProjectWorkspaceState _projectWorkspaceState;
-    private TestTagHelperResolver _tagHelperResolver;
    private readonly ImmutableArray<TagHelperDescriptor> _someTagHelpers;
    private readonly Func<Task<TextAndVersion>> _textLoader;
    private readonly SourceText _text;

+    [AllowNull]
+    private TestTagHelperResolver _tagHelperResolver;
+
    public ProjectStateTest(ITestOutputHelper testOutput)
        : base(testOutput)
    {
        _hostProject = new HostProject(TestProjectData.SomeProject.FilePath, TestProjectData.SomeProject.IntermediateOutputPath, FallbackRazorConfiguration.MVC_2_0, TestProjectData.SomeProject.RootNamespace);
        _hostProjectWithConfigurationChange = new HostProject(TestProjectData.SomeProject.FilePath, TestProjectData.SomeProject.IntermediateOutputPath, FallbackRazorConfiguration.MVC_1_0, TestProjectData.SomeProject.RootNamespace);
-        _projectWorkspaceState = new ProjectWorkspaceState(
+        _projectWorkspaceState = ProjectWorkspaceState.Create(
            ImmutableArray.Create(
-                TagHelperDescriptorBuilder.Create("TestTagHelper", "TestAssembly").Build()),
-            csharpLanguageVersion: default);
+                TagHelperDescriptorBuilder.Create("TestTagHelper", "TestAssembly").Build()));

        _someTagHelpers = ImmutableArray.Create(
            TagHelperDescriptorBuilder.Create("Test1", "TestAssembly").Build());
@ -72,7 +72,7 @@ public class ProjectStateTest : WorkspaceTestBase
    public void GetImportDocumentTargetPaths_DoesNotIncludeCurrentImport()
    {
        // Arrange
-        var state = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState);
+        var state = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState);

        // Act
        var paths = state.GetImportDocumentTargetPaths(TestProjectData.SomeProjectComponentImportFile1);
@ -87,7 +87,7 @@ public class ProjectStateTest : WorkspaceTestBase
        // Arrange

        // Act
-        var state = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState);
+        var state = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState);

        // Assert
        Assert.Empty(state.Documents);
@ -98,7 +98,7 @@ public class ProjectStateTest : WorkspaceTestBase
    public void ProjectState_AddHostDocument_ToEmpty()
    {
        // Arrange
-        var original = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState);
+        var original = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState);

        // Act
        var state = original.WithAddedHostDocument(_documents[0], DocumentState.EmptyLoader);
@ -116,7 +116,7 @@ public class ProjectStateTest : WorkspaceTestBase
    public async Task ProjectState_AddHostDocument_DocumentIsEmpty()
    {
        // Arrange
-        var original = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState);
+        var original = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState);

        // Act
        var state = original.WithAddedHostDocument(_documents[0], DocumentState.EmptyLoader);
@ -130,7 +130,7 @@ public class ProjectStateTest : WorkspaceTestBase
    public void ProjectState_AddHostDocument_ToProjectWithDocuments()
    {
        // Arrange
-        var original = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState)
+        var original = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState)
            .WithAddedHostDocument(_documents[2], DocumentState.EmptyLoader)
            .WithAddedHostDocument(_documents[1], DocumentState.EmptyLoader);

@ -154,7 +154,7 @@ public class ProjectStateTest : WorkspaceTestBase
        // Arrange

        // Act
-        var state = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState)
+        var state = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState)
            .WithAddedHostDocument(TestProjectData.SomeProjectFile1, DocumentState.EmptyLoader)
            .WithAddedHostDocument(TestProjectData.SomeProjectFile2, DocumentState.EmptyLoader)
            .WithAddedHostDocument(TestProjectData.SomeProjectNestedFile3, DocumentState.EmptyLoader)
@ -193,7 +193,7 @@ public class ProjectStateTest : WorkspaceTestBase
    public void ProjectState_AddHostDocument_TracksImports_AddImportFile()
    {
        // Arrange
-        var original = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState)
+        var original = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState)
            .WithAddedHostDocument(TestProjectData.SomeProjectFile1, DocumentState.EmptyLoader)
            .WithAddedHostDocument(TestProjectData.SomeProjectFile2, DocumentState.EmptyLoader)
            .WithAddedHostDocument(TestProjectData.SomeProjectNestedFile3, DocumentState.EmptyLoader)
@ -236,7 +236,7 @@ public class ProjectStateTest : WorkspaceTestBase
    public void ProjectState_AddHostDocument_RetainsComputedState()
    {
        // Arrange
-        var original = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState)
+        var original = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState)
            .WithAddedHostDocument(_documents[2], DocumentState.EmptyLoader)
            .WithAddedHostDocument(_documents[1], DocumentState.EmptyLoader);

@ -269,7 +269,7 @@ public class ProjectStateTest : WorkspaceTestBase
    public void ProjectState_AddHostDocument_DuplicateNoops()
    {
        // Arrange
-        var original = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState)
+        var original = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState)
            .WithAddedHostDocument(_documents[2], DocumentState.EmptyLoader)
            .WithAddedHostDocument(_documents[1], DocumentState.EmptyLoader);

@ -284,7 +284,7 @@ public class ProjectStateTest : WorkspaceTestBase
    public async Task ProjectState_WithChangedHostDocument_Loader()
    {
        // Arrange
-        var original = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState)
+        var original = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState)
            .WithAddedHostDocument(_documents[2], DocumentState.EmptyLoader)
            .WithAddedHostDocument(_documents[1], DocumentState.EmptyLoader);

@ -304,7 +304,7 @@ public class ProjectStateTest : WorkspaceTestBase
    public async Task ProjectState_WithChangedHostDocument_Snapshot()
    {
        // Arrange
-        var original = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState)
+        var original = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState)
            .WithAddedHostDocument(_documents[2], DocumentState.EmptyLoader)
            .WithAddedHostDocument(_documents[1], DocumentState.EmptyLoader);

@ -324,7 +324,7 @@ public class ProjectStateTest : WorkspaceTestBase
    public void ProjectState_WithChangedHostDocument_Loader_RetainsComputedState()
    {
        // Arrange
-        var original = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState)
+        var original = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState)
            .WithAddedHostDocument(_documents[2], DocumentState.EmptyLoader)
            .WithAddedHostDocument(_documents[1], DocumentState.EmptyLoader);

@ -356,7 +356,7 @@ public class ProjectStateTest : WorkspaceTestBase
    public void ProjectState_WithChangedHostDocument_Snapshot_RetainsComputedState()
    {
        // Arrange
-        var original = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState)
+        var original = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState)
            .WithAddedHostDocument(_documents[2], DocumentState.EmptyLoader)
            .WithAddedHostDocument(_documents[1], DocumentState.EmptyLoader);

@ -388,7 +388,7 @@ public class ProjectStateTest : WorkspaceTestBase
    public void ProjectState_WithChangedHostDocument_Loader_NotFoundNoops()
    {
        // Arrange
-        var original = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState)
+        var original = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState)
            .WithAddedHostDocument(_documents[2], DocumentState.EmptyLoader)
            .WithAddedHostDocument(_documents[1], DocumentState.EmptyLoader);

@ -403,7 +403,7 @@ public class ProjectStateTest : WorkspaceTestBase
    public void ProjectState_WithChangedHostDocument_Snapshot_NotFoundNoops()
    {
        // Arrange
-        var original = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState)
+        var original = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState)
            .WithAddedHostDocument(_documents[2], DocumentState.EmptyLoader)
            .WithAddedHostDocument(_documents[1], DocumentState.EmptyLoader);

@ -418,7 +418,7 @@ public class ProjectStateTest : WorkspaceTestBase
    public void ProjectState_RemoveHostDocument_FromProjectWithDocuments()
    {
        // Arrange
-        var original = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState)
+        var original = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState)
            .WithAddedHostDocument(_documents[2], DocumentState.EmptyLoader)
            .WithAddedHostDocument(_documents[1], DocumentState.EmptyLoader);

@ -439,7 +439,7 @@ public class ProjectStateTest : WorkspaceTestBase
    public void ProjectState_RemoveHostDocument_TracksImports()
    {
        // Arrange
-        var original = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState)
+        var original = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState)
            .WithAddedHostDocument(TestProjectData.SomeProjectFile1, DocumentState.EmptyLoader)
            .WithAddedHostDocument(TestProjectData.SomeProjectFile2, DocumentState.EmptyLoader)
            .WithAddedHostDocument(TestProjectData.SomeProjectNestedFile3, DocumentState.EmptyLoader)
@ -479,7 +479,7 @@ public class ProjectStateTest : WorkspaceTestBase
    public void ProjectState_RemoveHostDocument_TracksImports_RemoveAllDocuments()
    {
        // Arrange
-        var original = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState)
+        var original = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState)
            .WithAddedHostDocument(TestProjectData.SomeProjectFile1, DocumentState.EmptyLoader)
            .WithAddedHostDocument(TestProjectData.SomeProjectFile2, DocumentState.EmptyLoader)
            .WithAddedHostDocument(TestProjectData.SomeProjectNestedFile3, DocumentState.EmptyLoader)
@ -501,7 +501,7 @@ public class ProjectStateTest : WorkspaceTestBase
    public void ProjectState_RemoveHostDocument_RetainsComputedState()
    {
        // Arrange
-        var original = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState)
+        var original = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState)
            .WithAddedHostDocument(_documents[2], DocumentState.EmptyLoader)
            .WithAddedHostDocument(_documents[1], DocumentState.EmptyLoader);

@ -533,7 +533,7 @@ public class ProjectStateTest : WorkspaceTestBase
    public void ProjectState_RemoveHostDocument_NotFoundNoops()
    {
        // Arrange
-        var original = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState)
+        var original = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState)
            .WithAddedHostDocument(_documents[2], DocumentState.EmptyLoader)
            .WithAddedHostDocument(_documents[1], DocumentState.EmptyLoader);

@ -548,7 +548,7 @@ public class ProjectStateTest : WorkspaceTestBase
    public void ProjectState_WithHostProject_ConfigurationChange_UpdatesConfigurationState()
    {
        // Arrange
-        var original = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState)
+        var original = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState)
            .WithAddedHostDocument(_documents[2], DocumentState.EmptyLoader)
            .WithAddedHostDocument(_documents[1], DocumentState.EmptyLoader);

@ -588,7 +588,7 @@ public class ProjectStateTest : WorkspaceTestBase
    public void ProjectState_WithHostProject_RootNamespaceChange_UpdatesConfigurationState()
    {
        // Arrange
-        var original = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState)
+        var original = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState)
            .WithAddedHostDocument(_documents[2], DocumentState.EmptyLoader)
            .WithAddedHostDocument(_documents[1], DocumentState.EmptyLoader);
        var hostProjectWithRootNamespaceChange = new HostProject(
@ -614,7 +614,7 @@ public class ProjectStateTest : WorkspaceTestBase
    public void ProjectState_WithHostProject_NoConfigurationChange_Noops()
    {
        // Arrange
-        var original = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState)
+        var original = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState)
            .WithAddedHostDocument(_documents[2], DocumentState.EmptyLoader)
            .WithAddedHostDocument(_documents[1], DocumentState.EmptyLoader);

@ -635,10 +635,10 @@ public class ProjectStateTest : WorkspaceTestBase
        var callCount = 0;

        var documents = ImmutableDictionary.CreateBuilder<string, DocumentState>(FilePathComparer.Instance);
-        documents[_documents[1].FilePath] = TestDocumentState.Create(Workspace.Services, _documents[1], onConfigurationChange: () => callCount++);
-        documents[_documents[2].FilePath] = TestDocumentState.Create(Workspace.Services, _documents[2], onConfigurationChange: () => callCount++);
+        documents[_documents[1].FilePath] = TestDocumentState.Create(_documents[1], onConfigurationChange: () => callCount++);
+        documents[_documents[2].FilePath] = TestDocumentState.Create(_documents[2], onConfigurationChange: () => callCount++);

-        var original = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState);
+        var original = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState);
        original.Documents = documents.ToImmutable();

        // Act
@ -654,7 +654,7 @@ public class ProjectStateTest : WorkspaceTestBase
    public void ProjectState_WithHostProject_ResetsImportedDocuments()
    {
        // Arrange
-        var original = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState);
+        var original = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState);
        original = original.WithAddedHostDocument(TestProjectData.SomeProjectFile1, DocumentState.EmptyLoader);

        // Act
@ -666,87 +666,11 @@ public class ProjectStateTest : WorkspaceTestBase
        Assert.Equal(TestProjectData.SomeProjectFile1.FilePath, documentFilePath);
    }

-    [Fact]
-    public void ProjectState_WithProjectWorkspaceState_Removed()
-    {
-        // Arrange
-        var emptyProjectWorkspaceState = new ProjectWorkspaceState(ImmutableArray<TagHelperDescriptor>.Empty, csharpLanguageVersion: default);
-        var original = ProjectState.Create(Workspace.Services, _hostProject, emptyProjectWorkspaceState)
-            .WithAddedHostDocument(_documents[2], DocumentState.EmptyLoader)
-            .WithAddedHostDocument(_documents[1], DocumentState.EmptyLoader);
-
-        // Force init
-        var originalTagHelpers = original.TagHelpers;
-        var originalProjectWorkspaceStateVersion = original.ProjectWorkspaceStateVersion;
-
-        // Act
-        var state = original.WithProjectWorkspaceState(null);
-
-        // Assert
-        Assert.NotEqual(original.Version, state.Version);
-        Assert.Null(state.ProjectWorkspaceState);
-
-        var actualTagHelpers = state.TagHelpers;
-        var actualProjectWorkspaceStateVersion = state.ProjectWorkspaceStateVersion;
-
-        // The configuration didn't change, and the tag helpers didn't actually change
-        Assert.Same(original.ProjectEngine, state.ProjectEngine);
-
-        Assert.Equal(originalTagHelpers.Length, actualTagHelpers.Length);
-        for (var i = 0; i < originalTagHelpers.Length; i++)
-        {
-            Assert.Same(originalTagHelpers[i], actualTagHelpers[i]);
-        }
-
-        Assert.NotEqual(originalProjectWorkspaceStateVersion, actualProjectWorkspaceStateVersion);
-
-        Assert.NotSame(original.Documents[_documents[1].FilePath], state.Documents[_documents[1].FilePath]);
-        Assert.NotSame(original.Documents[_documents[2].FilePath], state.Documents[_documents[2].FilePath]);
-    }
-
-    [Fact]
-    public void ProjectState_WithProjectWorkspaceState_Added()
-    {
-        // Arrange
-        var original = ProjectState.Create(Workspace.Services, _hostProject, null)
-            .WithAddedHostDocument(_documents[2], DocumentState.EmptyLoader)
-            .WithAddedHostDocument(_documents[1], DocumentState.EmptyLoader);
-
-        // Force init
-        var originalTagHelpers = original.TagHelpers;
-        var originalProjectWorkspaceStateVersion = original.ProjectWorkspaceStateVersion;
-        var newProjectWorkspaceState = ProjectWorkspaceState.Default;
-
-        // Act
-        var state = original.WithProjectWorkspaceState(newProjectWorkspaceState);
-
-        // Assert
-        Assert.NotEqual(original.Version, state.Version);
-        Assert.Same(newProjectWorkspaceState, state.ProjectWorkspaceState);
-
-        var actualTagHelpers = state.TagHelpers;
-        var actualProjectWorkspaceStateVersion = state.ProjectWorkspaceStateVersion;
-
-        // The configuration didn't change, and the tag helpers didn't actually change
-        Assert.Same(original.ProjectEngine, state.ProjectEngine);
-
-        Assert.Equal(originalTagHelpers.Length, actualTagHelpers.Length);
-        for (var i = 0; i < originalTagHelpers.Length; i++)
-        {
-            Assert.Same(originalTagHelpers[i], actualTagHelpers[i]);
-        }
-
-        Assert.NotEqual(originalProjectWorkspaceStateVersion, actualProjectWorkspaceStateVersion);
-
-        Assert.NotSame(original.Documents[_documents[1].FilePath], state.Documents[_documents[1].FilePath]);
-        Assert.NotSame(original.Documents[_documents[1].FilePath], state.Documents[_documents[1].FilePath]);
-    }
-
    [Fact]
    public void ProjectState_WithProjectWorkspaceState_Changed()
    {
        // Arrange
-        var original = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState)
+        var original = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState)
            .WithAddedHostDocument(_documents[2], DocumentState.EmptyLoader)
            .WithAddedHostDocument(_documents[1], DocumentState.EmptyLoader);

@ -754,7 +678,7 @@ public class ProjectStateTest : WorkspaceTestBase
        var originalTagHelpers = original.TagHelpers;
        var originalProjectWorkspaceStateVersion = original.ProjectWorkspaceStateVersion;

-        var changed = new ProjectWorkspaceState(_projectWorkspaceState.TagHelpers, LanguageVersion.CSharp6);
+        var changed = ProjectWorkspaceState.Create(_projectWorkspaceState.TagHelpers, LanguageVersion.CSharp6);

        // Act
        var state = original.WithProjectWorkspaceState(changed);
@ -785,7 +709,7 @@ public class ProjectStateTest : WorkspaceTestBase
    public void ProjectState_WithProjectWorkspaceState_Changed_TagHelpersChanged()
    {
        // Arrange
-        var original = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState)
+        var original = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState)
            .WithAddedHostDocument(_documents[2], DocumentState.EmptyLoader)
            .WithAddedHostDocument(_documents[1], DocumentState.EmptyLoader);

@ -793,7 +717,7 @@ public class ProjectStateTest : WorkspaceTestBase
        var originalTagHelpers = original.TagHelpers;
        var originalProjectWorkspaceStateVersion = original.ProjectWorkspaceStateVersion;

-        var changed = new ProjectWorkspaceState(ImmutableArray<TagHelperDescriptor>.Empty, csharpLanguageVersion: default);
+        var changed = ProjectWorkspaceState.Default;

        // Now create some tag helpers
        _tagHelperResolver.TagHelpers = _someTagHelpers;
@ -822,7 +746,7 @@ public class ProjectStateTest : WorkspaceTestBase
    public void ProjectState_WithProjectWorkspaceState_IdenticalState_Caches()
    {
        // Arrange
-        var original = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState)
+        var original = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState)
            .WithAddedHostDocument(_documents[2], DocumentState.EmptyLoader)
            .WithAddedHostDocument(_documents[1], DocumentState.EmptyLoader);

@ -830,7 +754,7 @@ public class ProjectStateTest : WorkspaceTestBase
        _ = original.TagHelpers;
        _ = original.ProjectWorkspaceStateVersion;

-        var changed = new ProjectWorkspaceState(original.TagHelpers, original.CSharpLanguageVersion);
+        var changed = ProjectWorkspaceState.Create(original.TagHelpers, original.CSharpLanguageVersion);

        // Now create some tag helpers
        _tagHelperResolver.TagHelpers = _someTagHelpers;
@ -849,13 +773,13 @@ public class ProjectStateTest : WorkspaceTestBase
        var callCount = 0;

        var documents = ImmutableDictionary.CreateBuilder<string, DocumentState>(FilePathComparer.Instance);
-        documents[_documents[1].FilePath] = TestDocumentState.Create(Workspace.Services, _documents[1], onProjectWorkspaceStateChange: () => callCount++);
-        documents[_documents[2].FilePath] = TestDocumentState.Create(Workspace.Services, _documents[2], onProjectWorkspaceStateChange: () => callCount++);
+        documents[_documents[1].FilePath] = TestDocumentState.Create(_documents[1], onProjectWorkspaceStateChange: () => callCount++);
+        documents[_documents[2].FilePath] = TestDocumentState.Create(_documents[2], onProjectWorkspaceStateChange: () => callCount++);

-        var original = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState);
+        var original = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState);
        original.Documents = documents.ToImmutable();

-        var changed = new ProjectWorkspaceState(ImmutableArray<TagHelperDescriptor>.Empty, csharpLanguageVersion: default);
+        var changed = ProjectWorkspaceState.Default;

        // Act
        var state = original.WithProjectWorkspaceState(changed);
@ -877,10 +801,10 @@ public class ProjectStateTest : WorkspaceTestBase
        var document4 = TestProjectData.AnotherProjectNestedFile4;

        var documents = ImmutableDictionary.CreateBuilder<string, DocumentState>(FilePathComparer.Instance);
-        documents[document1.FilePath] = TestDocumentState.Create(Workspace.Services, document1, onImportsChange: () => callCount++);
-        documents[document2.FilePath] = TestDocumentState.Create(Workspace.Services, document2, onImportsChange: () => callCount++);
-        documents[document3.FilePath] = TestDocumentState.Create(Workspace.Services, document3, onImportsChange: () => callCount++);
-        documents[document4.FilePath] = TestDocumentState.Create(Workspace.Services, document4, onImportsChange: () => callCount++);
+        documents[document1.FilePath] = TestDocumentState.Create(document1, onImportsChange: () => callCount++);
+        documents[document2.FilePath] = TestDocumentState.Create(document2, onImportsChange: () => callCount++);
+        documents[document3.FilePath] = TestDocumentState.Create(document3, onImportsChange: () => callCount++);
+        documents[document4.FilePath] = TestDocumentState.Create(document4, onImportsChange: () => callCount++);

        var importsToRelatedDocuments = ImmutableDictionary.CreateBuilder<string, ImmutableArray<string>>(FilePathComparer.Instance);
        importsToRelatedDocuments.Add(
@ -896,7 +820,7 @@ public class ProjectStateTest : WorkspaceTestBase
                TestProjectData.SomeProjectNestedFile3.FilePath,
                TestProjectData.AnotherProjectNestedFile4.FilePath));

-        var original = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState);
+        var original = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState);
        original.Documents = documents.ToImmutable();
        original.ImportsToRelatedDocuments = importsToRelatedDocuments.ToImmutable();

@ -920,10 +844,10 @@ public class ProjectStateTest : WorkspaceTestBase
        var document4 = TestProjectData.AnotherProjectNestedFile4;

        var documents = ImmutableDictionary.CreateBuilder<string, DocumentState>(FilePathComparer.Instance);
-        documents[document1.FilePath] = TestDocumentState.Create(Workspace.Services, document1, onImportsChange: () => callCount++);
-        documents[document2.FilePath] = TestDocumentState.Create(Workspace.Services, document2, onImportsChange: () => callCount++);
-        documents[document3.FilePath] = TestDocumentState.Create(Workspace.Services, document3, onImportsChange: () => callCount++);
-        documents[document4.FilePath] = TestDocumentState.Create(Workspace.Services, document4, onImportsChange: () => callCount++);
+        documents[document1.FilePath] = TestDocumentState.Create(document1, onImportsChange: () => callCount++);
+        documents[document2.FilePath] = TestDocumentState.Create(document2, onImportsChange: () => callCount++);
+        documents[document3.FilePath] = TestDocumentState.Create(document3, onImportsChange: () => callCount++);
+        documents[document4.FilePath] = TestDocumentState.Create(document4, onImportsChange: () => callCount++);

        var importsToRelatedDocuments = ImmutableDictionary.CreateBuilder<string, ImmutableArray<string>>(FilePathComparer.Instance);
        importsToRelatedDocuments.Add(
@ -939,7 +863,7 @@ public class ProjectStateTest : WorkspaceTestBase
                TestProjectData.SomeProjectNestedFile3.FilePath,
                TestProjectData.AnotherProjectNestedFile4.FilePath));

-        var original = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState);
+        var original = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState);
        original.Documents = documents.ToImmutable();
        original.ImportsToRelatedDocuments = importsToRelatedDocuments.ToImmutable();

@ -964,11 +888,11 @@ public class ProjectStateTest : WorkspaceTestBase
        var document5 = TestProjectData.AnotherProjectNestedImportFile;

        var documents = ImmutableDictionary.CreateBuilder<string, DocumentState>(FilePathComparer.Instance);
-        documents[document1.FilePath] = TestDocumentState.Create(Workspace.Services, document1, onImportsChange: () => callCount++);
-        documents[document2.FilePath] = TestDocumentState.Create(Workspace.Services, document2, onImportsChange: () => callCount++);
-        documents[document3.FilePath] = TestDocumentState.Create(Workspace.Services, document3, onImportsChange: () => callCount++);
-        documents[document4.FilePath] = TestDocumentState.Create(Workspace.Services, document4, onImportsChange: () => callCount++);
-        documents[document5.FilePath] = TestDocumentState.Create(Workspace.Services, document5, onImportsChange: () => callCount++);
+        documents[document1.FilePath] = TestDocumentState.Create(document1, onImportsChange: () => callCount++);
+        documents[document2.FilePath] = TestDocumentState.Create(document2, onImportsChange: () => callCount++);
+        documents[document3.FilePath] = TestDocumentState.Create(document3, onImportsChange: () => callCount++);
+        documents[document4.FilePath] = TestDocumentState.Create(document4, onImportsChange: () => callCount++);
+        documents[document5.FilePath] = TestDocumentState.Create(document5, onImportsChange: () => callCount++);

        var importsToRelatedDocuments = ImmutableDictionary.CreateBuilder<string, ImmutableArray<string>>(FilePathComparer.Instance);
        importsToRelatedDocuments.Add(
@ -985,7 +909,7 @@ public class ProjectStateTest : WorkspaceTestBase
                TestProjectData.SomeProjectNestedFile3.FilePath,
                TestProjectData.AnotherProjectNestedFile4.FilePath));

-        var original = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState);
+        var original = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState);
        original.Documents = documents.ToImmutable();
        original.ImportsToRelatedDocuments = importsToRelatedDocuments.ToImmutable();

@ -1010,11 +934,11 @@ public class ProjectStateTest : WorkspaceTestBase
        var document5 = TestProjectData.AnotherProjectNestedImportFile;

        var documents = ImmutableDictionary.CreateBuilder<string, DocumentState>(FilePathComparer.Instance);
-        documents[document1.FilePath] = TestDocumentState.Create(Workspace.Services, document1, onImportsChange: () => callCount++);
-        documents[document2.FilePath] = TestDocumentState.Create(Workspace.Services, document2, onImportsChange: () => callCount++);
-        documents[document3.FilePath] = TestDocumentState.Create(Workspace.Services, document3, onImportsChange: () => callCount++);
-        documents[document4.FilePath] = TestDocumentState.Create(Workspace.Services, document4, onImportsChange: () => callCount++);
-        documents[document5.FilePath] = TestDocumentState.Create(Workspace.Services, document5, onImportsChange: () => callCount++);
+        documents[document1.FilePath] = TestDocumentState.Create(document1, onImportsChange: () => callCount++);
+        documents[document2.FilePath] = TestDocumentState.Create(document2, onImportsChange: () => callCount++);
+        documents[document3.FilePath] = TestDocumentState.Create(document3, onImportsChange: () => callCount++);
+        documents[document4.FilePath] = TestDocumentState.Create(document4, onImportsChange: () => callCount++);
+        documents[document5.FilePath] = TestDocumentState.Create(document5, onImportsChange: () => callCount++);

        var importsToRelatedDocuments = ImmutableDictionary.CreateBuilder<string, ImmutableArray<string>>(FilePathComparer.Instance);
        importsToRelatedDocuments.Add(
@ -1031,7 +955,7 @@ public class ProjectStateTest : WorkspaceTestBase
                TestProjectData.SomeProjectNestedFile3.FilePath,
                TestProjectData.AnotherProjectNestedFile4.FilePath));

-        var original = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState);
+        var original = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState);
        original.Documents = documents.ToImmutable();
        original.ImportsToRelatedDocuments = importsToRelatedDocuments.ToImmutable();

@ -1056,11 +980,11 @@ public class ProjectStateTest : WorkspaceTestBase
        var document5 = TestProjectData.AnotherProjectNestedImportFile;

        var documents = ImmutableDictionary.CreateBuilder<string, DocumentState>(FilePathComparer.Instance);
-        documents[document1.FilePath] = TestDocumentState.Create(Workspace.Services, document1, onImportsChange: () => callCount++);
-        documents[document2.FilePath] = TestDocumentState.Create(Workspace.Services, document2, onImportsChange: () => callCount++);
-        documents[document3.FilePath] = TestDocumentState.Create(Workspace.Services, document3, onImportsChange: () => callCount++);
-        documents[document4.FilePath] = TestDocumentState.Create(Workspace.Services, document4, onImportsChange: () => callCount++);
-        documents[document5.FilePath] = TestDocumentState.Create(Workspace.Services, document5, onImportsChange: () => callCount++);
+        documents[document1.FilePath] = TestDocumentState.Create(document1, onImportsChange: () => callCount++);
+        documents[document2.FilePath] = TestDocumentState.Create(document2, onImportsChange: () => callCount++);
+        documents[document3.FilePath] = TestDocumentState.Create(document3, onImportsChange: () => callCount++);
+        documents[document4.FilePath] = TestDocumentState.Create(document4, onImportsChange: () => callCount++);
+        documents[document5.FilePath] = TestDocumentState.Create(document5, onImportsChange: () => callCount++);

        var importsToRelatedDocuments = ImmutableDictionary.CreateBuilder<string, ImmutableArray<string>>(FilePathComparer.Instance);
        importsToRelatedDocuments.Add(
@ -1077,7 +1001,7 @@ public class ProjectStateTest : WorkspaceTestBase
                TestProjectData.SomeProjectNestedFile3.FilePath,
                TestProjectData.AnotherProjectNestedFile4.FilePath));

-        var original = ProjectState.Create(Workspace.Services, _hostProject, _projectWorkspaceState);
+        var original = ProjectState.Create(ProjectEngineFactory, _hostProject, _projectWorkspaceState);
        original.Documents = documents.ToImmutable();
        original.ImportsToRelatedDocuments = importsToRelatedDocuments.ToImmutable();

@ -1092,17 +1016,15 @@ public class ProjectStateTest : WorkspaceTestBase
    private class TestDocumentState : DocumentState
    {
        public static TestDocumentState Create(
-            HostWorkspaceServices services,
            HostDocument hostDocument,
-            Func<Task<TextAndVersion>> loader = null,
-            Action onTextChange = null,
-            Action onTextLoaderChange = null,
-            Action onConfigurationChange = null,
-            Action onImportsChange = null,
-            Action onProjectWorkspaceStateChange = null)
+            Func<Task<TextAndVersion>>? loader = null,
+            Action? onTextChange = null,
+            Action? onTextLoaderChange = null,
+            Action? onConfigurationChange = null,
+            Action? onImportsChange = null,
+            Action? onProjectWorkspaceStateChange = null)
        {
            return new TestDocumentState(
-                services,
                hostDocument,
                null,
                null,
@ -1114,24 +1036,23 @@ public class ProjectStateTest : WorkspaceTestBase
                onProjectWorkspaceStateChange);
        }

-        private readonly Action _onTextChange;
-        private readonly Action _onTextLoaderChange;
-        private readonly Action _onConfigurationChange;
-        private readonly Action _onImportsChange;
-        private readonly Action _onProjectWorkspaceStateChange;
+        private readonly Action? _onTextChange;
+        private readonly Action? _onTextLoaderChange;
+        private readonly Action? _onConfigurationChange;
+        private readonly Action? _onImportsChange;
+        private readonly Action? _onProjectWorkspaceStateChange;

        private TestDocumentState(
-            HostWorkspaceServices services,
            HostDocument hostDocument,
-            SourceText text,
+            SourceText? text,
            VersionStamp? version,
-            Func<Task<TextAndVersion>> loader,
-            Action onTextChange,
-            Action onTextLoaderChange,
-            Action onConfigurationChange,
-            Action onImportsChange,
-            Action onProjectWorkspaceStateChange)
-            : base(services, hostDocument, text, version, loader)
+            Func<Task<TextAndVersion>>? loader,
+            Action? onTextChange,
+            Action? onTextLoaderChange,
+            Action? onConfigurationChange,
+            Action? onImportsChange,
+            Action? onProjectWorkspaceStateChange)
+            : base(hostDocument, text, version, loader)
        {
            _onTextChange = onTextChange;
            _onTextLoaderChange = onTextLoaderChange;
--- a/src/Razor/test/Microsoft.CodeAnalysis.Razor.Workspaces.Test/RazorSpanMappingServiceTest.cs
+++ b/src/Razor/test/Microsoft.CodeAnalysis.Razor.Workspaces.Test/RazorSpanMappingServiceTest.cs
@ -7,6 +7,7 @@ using System;
 using System.Collections.Generic;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Razor.Language;
+using Microsoft.AspNetCore.Razor.ProjectSystem;
 using Microsoft.AspNetCore.Razor.Test.Common;
 using Microsoft.AspNetCore.Razor.Test.Common.Workspaces;
 using Microsoft.CodeAnalysis.Host;
@ -36,7 +37,7 @@ public class RazorSpanMappingServiceTest(ITestOutputHelper testOutput) : Workspa
 ");

        var project = new ProjectSnapshot(
-            ProjectState.Create(Workspace.Services, _hostProject)
+            ProjectState.Create(ProjectEngineFactory, _hostProject, ProjectWorkspaceState.Default)
            .WithAddedHostDocument(_hostDocument, () => Task.FromResult(TextAndVersion.Create(sourceText, VersionStamp.Create()))));

        var document = project.GetDocument(_hostDocument.FilePath);
@ -68,7 +69,7 @@ public class RazorSpanMappingServiceTest(ITestOutputHelper testOutput) : Workspa
 ");

        var project = new ProjectSnapshot(
-            ProjectState.Create(Workspace.Services, _hostProject)
+            ProjectState.Create(ProjectEngineFactory, _hostProject, ProjectWorkspaceState.Default)
            .WithAddedHostDocument(_hostDocument, () => Task.FromResult(TextAndVersion.Create(sourceText, VersionStamp.Create()))));

        var document = project.GetDocument(_hostDocument.FilePath);
@ -101,7 +102,7 @@ public class RazorSpanMappingServiceTest(ITestOutputHelper testOutput) : Workspa
 ");

        var project = new ProjectSnapshot(
-            ProjectState.Create(Workspace.Services, _hostProject)
+            ProjectState.Create(ProjectEngineFactory, _hostProject, ProjectWorkspaceState.Default)
            .WithAddedHostDocument(_hostDocument, () => Task.FromResult(TextAndVersion.Create(sourceText, VersionStamp.Create()))));

        var document = project.GetDocument(_hostDocument.FilePath);
@ -133,7 +134,7 @@ public class RazorSpanMappingServiceTest(ITestOutputHelper testOutput) : Workspa
 ");

        var project = new ProjectSnapshot(
-            ProjectState.Create(Workspace.Services, _hostProject)
+            ProjectState.Create(ProjectEngineFactory, _hostProject, ProjectWorkspaceState.Default)
            .WithAddedHostDocument(_hostDocument, () => Task.FromResult(TextAndVersion.Create(sourceText, VersionStamp.Create()))));

        var document = project.GetDocument(_hostDocument.FilePath);
--- a/src/Razor/test/Microsoft.CodeAnalysis.Remote.Razor.Test/OOPTagHelperResolverTest.cs
+++ b/src/Razor/test/Microsoft.CodeAnalysis.Remote.Razor.Test/OOPTagHelperResolverTest.cs
@ -10,6 +10,7 @@ using Microsoft.AspNetCore.Razor;
 using Microsoft.AspNetCore.Razor.Language;
 using Microsoft.AspNetCore.Razor.Serialization;
 using Microsoft.AspNetCore.Razor.Telemetry;
+using Microsoft.AspNetCore.Razor.Test.Common.Workspaces;
 using Microsoft.AspNetCore.Razor.Utilities;
 using Microsoft.CodeAnalysis.Razor;
 using Microsoft.CodeAnalysis.Razor.ProjectSystem;
@ -24,7 +25,6 @@ public partial class OOPTagHelperResolverTest : TagHelperDescriptorTestBase
 {
    private readonly ProjectSnapshotProjectEngineFactory _engineFactory;
    private readonly Lazy<IProjectEngineFactory, ICustomProjectEngineFactoryMetadata>[] _customFactories;
-    private readonly IFallbackProjectEngineFactory _fallbackFactory;
    private readonly HostProject _hostProject_For_2_0;
    private readonly HostProject _hostProject_For_NonSerializableConfiguration;
    private readonly ProjectSnapshotManagerBase _projectManager;
@ -37,10 +37,10 @@ public partial class OOPTagHelperResolverTest : TagHelperDescriptorTestBase
        _hostProject_For_2_0 = new HostProject("Test.csproj", "/obj", FallbackRazorConfiguration.MVC_2_0, rootNamespace: null);
        _hostProject_For_NonSerializableConfiguration = new HostProject(
            "Test.csproj", "/obj",
-            new ProjectSystemRazorConfiguration(RazorLanguageVersion.Version_2_1, "Random-0.1", Array.Empty<RazorExtension>()), rootNamespace: null);
+            new ProjectSystemRazorConfiguration(RazorLanguageVersion.Version_2_1, "Random-0.1", []), rootNamespace: null);

-        _customFactories = new Lazy<IProjectEngineFactory, ICustomProjectEngineFactoryMetadata>[]
-        {
+        _customFactories =
+        [
            new Lazy<IProjectEngineFactory, ICustomProjectEngineFactoryMetadata>(
                () => Mock.Of<IProjectEngineFactory>(MockBehavior.Strict),
                new ExportCustomProjectEngineFactoryAttribute("MVC-2.0") { SupportsSerialization = true, }),
@ -49,18 +49,20 @@ public partial class OOPTagHelperResolverTest : TagHelperDescriptorTestBase
            new Lazy<IProjectEngineFactory, ICustomProjectEngineFactoryMetadata>(
                () => Mock.Of<IProjectEngineFactory>(MockBehavior.Strict),
                new ExportCustomProjectEngineFactoryAttribute("Test-2") { SupportsSerialization = false, }),
-        };
+        ];

-        _fallbackFactory = new FallbackProjectEngineFactory();
+        var fallbackFactory = new FallbackProjectEngineFactory();

-        _workspace = new AdhocWorkspace();
+        _engineFactory = new DefaultProjectSnapshotProjectEngineFactory(fallbackFactory, _customFactories);
+        var testServices = TestServices.Create([_engineFactory], []);
+
+        _workspace = new AdhocWorkspace(testServices);
        AddDisposable(_workspace);

        var info = ProjectInfo.Create(ProjectId.CreateNewId("Test"), VersionStamp.Default, "Test", "Test", LanguageNames.CSharp, filePath: "Test.csproj");
        _workspaceProject = _workspace.CurrentSolution.AddProject(info).GetProject(info.Id).AssumeNotNull();

        _projectManager = new TestProjectSnapshotManager(_workspace);
-        _engineFactory = new DefaultProjectSnapshotProjectEngineFactory(_fallbackFactory, _customFactories);
    }

    [Fact]
--- a/src/Razor/test/Microsoft.VisualStudio.Editor.Razor.Test/DefaultProjectSnapshotProjectEngineFactoryTest.cs
+++ b/src/Razor/test/Microsoft.VisualStudio.Editor.Razor.Test/DefaultProjectSnapshotProjectEngineFactoryTest.cs
@ -8,9 +8,9 @@ using System.Reflection;
 using Microsoft.AspNetCore.Razor.Language;
 using Microsoft.AspNetCore.Razor.ProjectSystem;
 using Microsoft.AspNetCore.Razor.Test.Common;
-using Microsoft.AspNetCore.Razor.Test.Common.Workspaces;
 using Microsoft.CodeAnalysis.Razor.ProjectSystem;
 using Microsoft.CodeAnalysis.Razor.Workspaces;
+using Moq;
 using Xunit;
 using Xunit.Abstractions;
 using Mvc1_X = Microsoft.AspNetCore.Mvc.Razor.Extensions.Version1_X;
@ -24,56 +24,45 @@ public class DefaultProjectSnapshotProjectEngineFactoryTest : ToolingTestBase
 {
    private readonly Lazy<IProjectEngineFactory, ICustomProjectEngineFactoryMetadata>[] _customFactories;
    private readonly IFallbackProjectEngineFactory _fallbackFactory;
-    private readonly HostProject _hostProject_For_1_0;
-    private readonly HostProject _hostProject_For_1_1;
-    private readonly HostProject _hostProject_For_2_0;
-    private readonly HostProject _hostProject_For_2_1;
-    private readonly HostProject _hostProject_For_3_0;
-    private readonly HostProject _hostProject_For_UnknownConfiguration;
    private readonly IProjectSnapshot _snapshot_For_1_0;
    private readonly IProjectSnapshot _snapshot_For_1_1;
    private readonly IProjectSnapshot _snapshot_For_2_0;
    private readonly IProjectSnapshot _snapshot_For_2_1;
    private readonly IProjectSnapshot _snapshot_For_3_0;
    private readonly IProjectSnapshot _snapshot_For_UnknownConfiguration;
-    private readonly ProjectWorkspaceState _projectWorkspaceState;
-    private readonly Workspace _workspace;

    public DefaultProjectSnapshotProjectEngineFactoryTest(ITestOutputHelper testOutput)
        : base(testOutput)
    {
-        _workspace = TestWorkspace.Create();
-        AddDisposable(_workspace);
-
-        _projectWorkspaceState = ProjectWorkspaceState.Default;
-
        var projectFilePath = "/TestPath/SomePath/Test.csproj";
        var intermediateOutputPath = "/TestPath/SomePath/obj";
-        _hostProject_For_1_0 = new HostProject(projectFilePath, intermediateOutputPath, FallbackRazorConfiguration.MVC_1_0, "Test");
-        _hostProject_For_1_1 = new HostProject(projectFilePath, intermediateOutputPath, FallbackRazorConfiguration.MVC_1_1, "Test");
-        _hostProject_For_2_0 = new HostProject(projectFilePath, intermediateOutputPath, FallbackRazorConfiguration.MVC_2_0, "Test");
+        var hostProject_For_1_0 = new HostProject(projectFilePath, intermediateOutputPath, FallbackRazorConfiguration.MVC_1_0, "Test");
+        var hostProject_For_1_1 = new HostProject(projectFilePath, intermediateOutputPath, FallbackRazorConfiguration.MVC_1_1, "Test");
+        var hostProject_For_2_0 = new HostProject(projectFilePath, intermediateOutputPath, FallbackRazorConfiguration.MVC_2_0, "Test");

-        _hostProject_For_2_1 = new HostProject(
+        var hostProject_For_2_1 = new HostProject(
            projectFilePath, intermediateOutputPath,
            new ProjectSystemRazorConfiguration(RazorLanguageVersion.Version_2_1, "MVC-2.1", Array.Empty<RazorExtension>()), "Test");

-        _hostProject_For_3_0 = new HostProject(
+        var hostProject_For_3_0 = new HostProject(
            projectFilePath, intermediateOutputPath,
            new ProjectSystemRazorConfiguration(RazorLanguageVersion.Version_3_0, "MVC-3.0", Array.Empty<RazorExtension>()), "Test");

-        _hostProject_For_UnknownConfiguration = new HostProject(
+        var hostProject_For_UnknownConfiguration = new HostProject(
            projectFilePath, intermediateOutputPath,
            new ProjectSystemRazorConfiguration(RazorLanguageVersion.Version_2_1, "Random-0.1", Array.Empty<RazorExtension>()), rootNamespace: null);

-        _snapshot_For_1_0 = new ProjectSnapshot(ProjectState.Create(_workspace.Services, _hostProject_For_1_0, _projectWorkspaceState));
-        _snapshot_For_1_1 = new ProjectSnapshot(ProjectState.Create(_workspace.Services, _hostProject_For_1_1, _projectWorkspaceState));
-        _snapshot_For_2_0 = new ProjectSnapshot(ProjectState.Create(_workspace.Services, _hostProject_For_2_0, _projectWorkspaceState));
-        _snapshot_For_2_1 = new ProjectSnapshot(ProjectState.Create(_workspace.Services, _hostProject_For_2_1, _projectWorkspaceState));
-        _snapshot_For_3_0 = new ProjectSnapshot(ProjectState.Create(_workspace.Services, _hostProject_For_3_0, _projectWorkspaceState));
-        _snapshot_For_UnknownConfiguration = new ProjectSnapshot(ProjectState.Create(_workspace.Services, _hostProject_For_UnknownConfiguration, _projectWorkspaceState));
+        var projectEngineFactory = Mock.Of<ProjectSnapshotProjectEngineFactory>(MockBehavior.Strict);

-        _customFactories = new Lazy<IProjectEngineFactory, ICustomProjectEngineFactoryMetadata>[]
-        {
+        _snapshot_For_1_0 = new ProjectSnapshot(ProjectState.Create(projectEngineFactory, hostProject_For_1_0, ProjectWorkspaceState.Default));
+        _snapshot_For_1_1 = new ProjectSnapshot(ProjectState.Create(projectEngineFactory, hostProject_For_1_1, ProjectWorkspaceState.Default));
+        _snapshot_For_2_0 = new ProjectSnapshot(ProjectState.Create(projectEngineFactory, hostProject_For_2_0, ProjectWorkspaceState.Default));
+        _snapshot_For_2_1 = new ProjectSnapshot(ProjectState.Create(projectEngineFactory, hostProject_For_2_1, ProjectWorkspaceState.Default));
+        _snapshot_For_3_0 = new ProjectSnapshot(ProjectState.Create(projectEngineFactory, hostProject_For_3_0, ProjectWorkspaceState.Default));
+        _snapshot_For_UnknownConfiguration = new ProjectSnapshot(ProjectState.Create(projectEngineFactory, hostProject_For_UnknownConfiguration, ProjectWorkspaceState.Default));
+
+        _customFactories =
+        [
            new Lazy<IProjectEngineFactory, ICustomProjectEngineFactoryMetadata>(
                () => new LegacyProjectEngineFactory_1_0(),
                typeof(LegacyProjectEngineFactory_1_0).GetCustomAttribute<ExportCustomProjectEngineFactoryAttribute>()),
@ -89,7 +78,7 @@ public class DefaultProjectSnapshotProjectEngineFactoryTest : ToolingTestBase
            new Lazy<IProjectEngineFactory, ICustomProjectEngineFactoryMetadata>(
                () => new LegacyProjectEngineFactory_3_0(),
                typeof(LegacyProjectEngineFactory_3_0).GetCustomAttribute<ExportCustomProjectEngineFactoryAttribute>()),
-        };
+        ];

        _fallbackFactory = new FallbackProjectEngineFactory();
    }
--- a/src/Razor/test/Microsoft.VisualStudio.Editor.Razor.Test/DefaultProjectWorkspaceStateGeneratorTest.cs
+++ b/src/Razor/test/Microsoft.VisualStudio.Editor.Razor.Test/DefaultProjectWorkspaceStateGeneratorTest.cs
@ -18,6 +18,7 @@ using Microsoft.AspNetCore.Razor.Test.Common.ProjectSystem;
 using Microsoft.AspNetCore.Razor.Test.Common.Workspaces;
 using Microsoft.CodeAnalysis.Host;
 using Microsoft.CodeAnalysis.Razor.ProjectSystem;
+using Moq;
 using Xunit;
 using Xunit.Abstractions;

@ -34,13 +35,15 @@ public class DefaultProjectWorkspaceStateGeneratorTest : ProjectSnapshotManagerD
    public DefaultProjectWorkspaceStateGeneratorTest(ITestOutputHelper testOutput)
        : base(testOutput)
    {
+        var projectEngineFactory = Mock.Of<ProjectSnapshotProjectEngineFactory>(MockBehavior.Strict);
+
        var tagHelperResolver = new TestTagHelperResolver()
        {
            TagHelpers = ImmutableArray.Create(TagHelperDescriptorBuilder.Create("ResolvableTagHelper", "TestAssembly").Build())
        };

        _resolvableTagHelpers = tagHelperResolver.TagHelpers;
-        var workspaceServices = new List<IWorkspaceService>() { tagHelperResolver };
+        var workspaceServices = new List<IWorkspaceService>() { tagHelperResolver, projectEngineFactory };
        var testServices = TestServices.Create(workspaceServices, Enumerable.Empty<ILanguageService>());
        _workspace = TestWorkspace.Create(testServices);
        AddDisposable(_workspace);
@ -53,10 +56,10 @@ public class DefaultProjectWorkspaceStateGeneratorTest : ProjectSnapshotManagerD
            LanguageNames.CSharp,
            TestProjectData.SomeProject.FilePath));
        _workspaceProject = solution.GetProject(projectId);
-        _projectSnapshot = new ProjectSnapshot(ProjectState.Create(_workspace.Services, TestProjectData.SomeProject));
-        _projectWorkspaceStateWithTagHelpers = new ProjectWorkspaceState(ImmutableArray.Create(
-            TagHelperDescriptorBuilder.Create("TestTagHelper", "TestAssembly").Build()),
-            csharpLanguageVersion: default);
+        _projectSnapshot = new ProjectSnapshot(
+            ProjectState.Create(projectEngineFactory, TestProjectData.SomeProject, ProjectWorkspaceState.Default));
+        _projectWorkspaceStateWithTagHelpers = ProjectWorkspaceState.Create(ImmutableArray.Create(
+            TagHelperDescriptorBuilder.Create("TestTagHelper", "TestAssembly").Build()));
    }

    [UIFact]
--- a/src/Razor/test/Microsoft.VisualStudio.LanguageServerClient.Razor.Test/RazorDocumentOptionsServiceTest.cs
+++ b/src/Razor/test/Microsoft.VisualStudio.LanguageServerClient.Razor.Test/RazorDocumentOptionsServiceTest.cs
@ -9,6 +9,7 @@ using System.Linq;
 using System.Runtime.InteropServices;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Razor.Language;
+using Microsoft.AspNetCore.Razor.ProjectSystem;
 using Microsoft.AspNetCore.Razor.Test.Common.Workspaces;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.Formatting;
@ -103,7 +104,7 @@ public class RazorDocumentOptionsServiceTest : WorkspaceTestBase
            Path.Combine(baseDirectory, "SomeProject", "File1.cshtml"), "File1.cshtml", FileKinds.Legacy);

        var project = new ProjectSnapshot(
-            ProjectState.Create(Workspace.Services, hostProject)
+            ProjectState.Create(ProjectEngineFactory, hostProject, ProjectWorkspaceState.Default)
            .WithAddedHostDocument(hostDocument, () => Task.FromResult(TextAndVersion.Create(sourceText, VersionStamp.Create()))));

        var documentSnapshot = project.GetDocument(hostDocument.FilePath);
--- a/src/Razor/test/Microsoft.VisualStudio.LanguageServerClient.Razor.Test/RazorProjectInfoPublisherTest.cs
+++ b/src/Razor/test/Microsoft.VisualStudio.LanguageServerClient.Razor.Test/RazorProjectInfoPublisherTest.cs
@ -36,8 +36,8 @@ public class RazorProjectInfoPublisherTest(ITestOutputHelper testOutput) : Langu
            new TagHelperDescriptor(FileKinds.Component, "Namespace.FileNameOther", "Assembly", "FileName", "FileName document", "FileName hint",
                caseSensitive: false, tagMatchingRules: default, attributeDescriptors: default, allowedChildTags: default, metadata: null, diagnostics: default));

-        var initialProjectSnapshot = CreateProjectSnapshot(@"C:\path\to\project.csproj", new ProjectWorkspaceState(tagHelpers, CodeAnalysis.CSharp.LanguageVersion.Preview));
-        var expectedProjectSnapshot = CreateProjectSnapshot(@"C:\path\to\project.csproj", new ProjectWorkspaceState(ImmutableArray<TagHelperDescriptor>.Empty, CodeAnalysis.CSharp.LanguageVersion.Preview));
+        var initialProjectSnapshot = CreateProjectSnapshot(@"C:\path\to\project.csproj", ProjectWorkspaceState.Create(tagHelpers, CodeAnalysis.CSharp.LanguageVersion.Preview));
+        var expectedProjectSnapshot = CreateProjectSnapshot(@"C:\path\to\project.csproj", ProjectWorkspaceState.Create(CodeAnalysis.CSharp.LanguageVersion.Preview));
        var expectedConfigurationFilePath = @"C:\path\to\obj\bin\Debug\project.razor.bin";
        var publisher = new TestRazorProjectInfoPublisher(
            projectConfigurationFilePathStore,
@ -220,7 +220,7 @@ public class RazorProjectInfoPublisherTest(ITestOutputHelper testOutput) : Langu
        var projectConfigurationFilePathStore = new DefaultProjectConfigurationFilePathStore();

        var serializationSuccessful = false;
-        var projectSnapshot = CreateProjectSnapshot(@"C:\path\to\project.csproj", new ProjectWorkspaceState(ImmutableArray<TagHelperDescriptor>.Empty, CodeAnalysis.CSharp.LanguageVersion.CSharp7_3));
+        var projectSnapshot = CreateProjectSnapshot(@"C:\path\to\project.csproj", ProjectWorkspaceState.Create(CodeAnalysis.CSharp.LanguageVersion.CSharp7_3));
        var expectedConfigurationFilePath = @"C:\path\to\obj\bin\Debug\project.razor.bin";
        var publisher = new TestRazorProjectInfoPublisher(
            projectConfigurationFilePathStore,
@ -255,8 +255,8 @@ public class RazorProjectInfoPublisherTest(ITestOutputHelper testOutput) : Langu
        var projectConfigurationFilePathStore = new DefaultProjectConfigurationFilePathStore();

        var serializationSuccessful = false;
-        var projectSnapshot = CreateProjectSnapshot(@"C:\path\to\project.csproj", new ProjectWorkspaceState(ImmutableArray<TagHelperDescriptor>.Empty, CodeAnalysis.CSharp.LanguageVersion.Default));
-        var changedProjectSnapshot = CreateProjectSnapshot(@"C:\path\to\project.csproj", new ProjectWorkspaceState(ImmutableArray<TagHelperDescriptor>.Empty, CodeAnalysis.CSharp.LanguageVersion.CSharp8));
+        var projectSnapshot = CreateProjectSnapshot(@"C:\path\to\project.csproj", ProjectWorkspaceState.Default);
+        var changedProjectSnapshot = CreateProjectSnapshot(@"C:\path\to\project.csproj", ProjectWorkspaceState.Create(CodeAnalysis.CSharp.LanguageVersion.CSharp8));
        var expectedConfigurationFilePath = @"C:\path\to\obj\bin\Debug\project.razor.bin";
        var aboutToChange = false;
        var publisher = new TestRazorProjectInfoPublisher(
@ -414,9 +414,10 @@ public class RazorProjectInfoPublisherTest(ITestOutputHelper testOutput) : Langu
            new TagHelperDescriptor(FileKinds.Component, "Namespace.FileNameOther", "Assembly", "FileName", "FileName document", "FileName hint",
                caseSensitive: false, tagMatchingRules: default, attributeDescriptors: default, allowedChildTags: default, metadata: null, diagnostics: default));

-        var secondSnapshot = CreateProjectSnapshot(@"C:\path\to\project.csproj", new ProjectWorkspaceState(tagHelpers, CodeAnalysis.CSharp.LanguageVersion.CSharp8), new string[]{
+        var secondSnapshot = CreateProjectSnapshot(@"C:\path\to\project.csproj", ProjectWorkspaceState.Create(tagHelpers, CodeAnalysis.CSharp.LanguageVersion.CSharp8),
+        [
            "FileName.razor"
-        });
+        ]);
        var expectedConfigurationFilePath = @"C:\path\to\obj\bin\Debug\project.razor.bin";
        var publisher = new TestRazorProjectInfoPublisher(
            projectConfigurationFilePathStore,
@ -517,7 +518,7 @@ public class RazorProjectInfoPublisherTest(ITestOutputHelper testOutput) : Langu
        var projectFilePath = @"C:\path\to\project.csproj";
        var hostProject = new HostProject(projectFilePath, Path.Combine(Path.GetDirectoryName(projectFilePath), "obj"), RazorConfiguration.Default, "TestRootNamespace");
        projectConfigurationFilePathStore.Set(hostProject.Key, expectedConfigurationFilePath);
-        var projectWorkspaceState = new ProjectWorkspaceState(ImmutableArray<TagHelperDescriptor>.Empty, CodeAnalysis.CSharp.LanguageVersion.Default);
+        var projectWorkspaceState = ProjectWorkspaceState.Default;

        // Act
        await RunOnDispatcherThreadAsync(() =>
@ -610,7 +611,7 @@ public class RazorProjectInfoPublisherTest(ITestOutputHelper testOutput) : Langu
        var projectFilePath = @"C:\path\to\project.csproj";
        var hostProject = new HostProject(projectFilePath, Path.Combine(Path.GetDirectoryName(projectFilePath), "obj"), RazorConfiguration.Default, "TestRootNamespace");
        projectConfigurationFilePathStore.Set(hostProject.Key, expectedConfigurationFilePath);
-        var projectWorkspaceState = new ProjectWorkspaceState(ImmutableArray<TagHelperDescriptor>.Empty, CodeAnalysis.CSharp.LanguageVersion.Default);
+        var projectWorkspaceState = ProjectWorkspaceState.Default;

        // Act
        await RunOnDispatcherThreadAsync(() =>
--- a/src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/ProjectSystem/DefaultProjectSnapshotManagerTest.cs
+++ b/src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/ProjectSystem/DefaultProjectSnapshotManagerTest.cs
@ -61,7 +61,7 @@ public class DefaultProjectSnapshotManagerTest : ProjectSnapshotManagerDispatche

        _projectManager = new TestProjectSnapshotManager(Enumerable.Empty<IProjectSnapshotChangeTrigger>(), Workspace, Dispatcher);

-        _projectWorkspaceStateWithTagHelpers = new ProjectWorkspaceState(_tagHelperResolver.TagHelpers, default);
+        _projectWorkspaceStateWithTagHelpers = ProjectWorkspaceState.Create(_tagHelperResolver.TagHelpers);

        _sourceText = SourceText.From("Hello world");
    }
--- a/src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/VsSolutionUpdatesProjectSnapshotChangeTriggerTest.cs
+++ b/src/Razor/test/Microsoft.VisualStudio.LanguageServices.Razor.Test/VsSolutionUpdatesProjectSnapshotChangeTriggerTest.cs
@ -8,6 +8,7 @@ using System.Collections.Immutable;
 using System.IO;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Razor.Language;
+using Microsoft.AspNetCore.Razor.ProjectSystem;
 using Microsoft.AspNetCore.Razor.Test.Common;
 using Microsoft.AspNetCore.Razor.Test.Common.ProjectSystem;
 using Microsoft.AspNetCore.Razor.Test.Common.Workspaces;
@ -39,14 +40,24 @@ public class VsSolutionUpdatesProjectSnapshotChangeTriggerTest : ToolingTestBase
        _someProject = new HostProject(TestProjectData.SomeProject.FilePath, TestProjectData.SomeProject.IntermediateOutputPath, FallbackRazorConfiguration.MVC_1_0, TestProjectData.SomeProject.RootNamespace);
        _someOtherProject = new HostProject(TestProjectData.AnotherProject.FilePath, TestProjectData.AnotherProject.IntermediateOutputPath, FallbackRazorConfiguration.MVC_2_0, TestProjectData.AnotherProject.RootNamespace);

-        _workspace = TestWorkspace.Create(w => _someWorkspaceProject = w.AddProject(ProjectInfo.Create(
-                ProjectId.CreateNewId(),
-                VersionStamp.Create(),
-                "SomeProject",
-                "SomeProject",
-                LanguageNames.CSharp,
-                filePath: _someProject.FilePath).WithCompilationOutputInfo(new CompilationOutputInfo().WithAssemblyPath(Path.Combine(_someProject.IntermediateOutputPath, "SomeProject.dll")))));
+        var projectEngineFactory = Mock.Of<ProjectSnapshotProjectEngineFactory>(MockBehavior.Strict);
+        var testServices = TestServices.Create([projectEngineFactory], []);

+        _workspace = TestWorkspace.Create(testServices,
+            w =>
+            {
+                _someWorkspaceProject = w.AddProject(
+                    ProjectInfo.Create(
+                        ProjectId.CreateNewId(),
+                        VersionStamp.Create(),
+                        "SomeProject",
+                        "SomeProject",
+                        LanguageNames.CSharp,
+                        filePath: _someProject.FilePath)
+                    .WithCompilationOutputInfo(
+                        new CompilationOutputInfo()
+                            .WithAssemblyPath(Path.Combine(_someProject.IntermediateOutputPath, "SomeProject.dll"))));
+            });
        AddDisposable(_workspace);
    }

@ -189,11 +200,17 @@ public class VsSolutionUpdatesProjectSnapshotChangeTriggerTest : ToolingTestBase
            .Returns(VSConstants.S_OK);

        var services = new Mock<IServiceProvider>(MockBehavior.Strict);
-        services.Setup(s => s.GetService(It.Is<Type>(f => f == typeof(SVsSolutionBuildManager)))).Returns(buildManager.Object);
+        services
+            .Setup(s => s.GetService(It.Is<Type>(f => f == typeof(SVsSolutionBuildManager))))
+            .Returns(buildManager.Object);
+
+        var projectEngineFactory = Mock.Of<ProjectSnapshotProjectEngineFactory>(MockBehavior.Strict);
+
        var projectSnapshot = new ProjectSnapshot(
            ProjectState.Create(
-                _workspace.Services,
-                new HostProject("/Some/Unknown/Path.csproj", "/Some/Unknown/obj", RazorConfiguration.Default, "Path")));
+                projectEngineFactory,
+                new HostProject("/Some/Unknown/Path.csproj", "/Some/Unknown/obj", RazorConfiguration.Default, "Path"),
+                ProjectWorkspaceState.Default));
        var expectedProjectPath = projectSnapshot.FilePath;

        var projectService = new Mock<TextBufferProjectService>(MockBehavior.Strict);
--- a/src/Razor/test/Microsoft.VisualStudio.LiveShare.Razor.Test/Guest/ProjectSnapshotSynchronizationServiceTest.cs
+++ b/src/Razor/test/Microsoft.VisualStudio.LiveShare.Razor.Test/Guest/ProjectSnapshotSynchronizationServiceTest.cs
@ -34,9 +34,8 @@ public class ProjectSnapshotSynchronizationServiceTest : WorkspaceTestBase

        _projectSnapshotManager = new TestProjectSnapshotManager(Workspace, new TestProjectSnapshotManagerDispatcher());

-        _projectWorkspaceStateWithTagHelpers = new ProjectWorkspaceState(ImmutableArray.Create(
-            TagHelperDescriptorBuilder.Create("TestTagHelper", "TestAssembly").Build()),
-            csharpLanguageVersion: default);
+        _projectWorkspaceStateWithTagHelpers = ProjectWorkspaceState.Create(ImmutableArray.Create(
+            TagHelperDescriptorBuilder.Create("TestTagHelper", "TestAssembly").Build()));
    }

    [Fact]
--- a/src/Razor/test/Microsoft.VisualStudio.LiveShare.Razor.Test/Host/DefaultProjectSnapshotManagerProxyTest.cs
+++ b/src/Razor/test/Microsoft.VisualStudio.LiveShare.Razor.Test/Host/DefaultProjectSnapshotManagerProxyTest.cs
@ -9,10 +9,11 @@ using System.Threading.Tasks;
 using Microsoft.AspNetCore.Razor.Language;
 using Microsoft.AspNetCore.Razor.ProjectSystem;
 using Microsoft.AspNetCore.Razor.Test.Common.Editor;
-using Microsoft.AspNetCore.Razor.Test.Common.Workspaces;
+using Microsoft.CodeAnalysis.Razor;
 using Microsoft.CodeAnalysis.Razor.ProjectSystem;
 using Microsoft.VisualStudio.LiveShare.Razor.Test;
 using Microsoft.VisualStudio.Threading;
+using Moq;
 using Xunit;
 using Xunit.Abstractions;

@ -20,33 +21,29 @@ namespace Microsoft.VisualStudio.LiveShare.Razor.Host;

 public class DefaultProjectSnapshotManagerProxyTest : ProjectSnapshotManagerDispatcherTestBase
 {
-    private readonly CodeAnalysis.Workspace _workspace;
    private readonly IProjectSnapshot _projectSnapshot1;
    private readonly IProjectSnapshot _projectSnapshot2;

    public DefaultProjectSnapshotManagerProxyTest(ITestOutputHelper testOutput)
        : base(testOutput)
    {
-        _workspace = TestWorkspace.Create();
-        AddDisposable(_workspace);
+        var projectEngineFactory = Mock.Of<ProjectSnapshotProjectEngineFactory>(MockBehavior.Strict);

-        var projectWorkspaceState1 = new ProjectWorkspaceState(ImmutableArray.Create(
-            TagHelperDescriptorBuilder.Create("test1", "TestAssembly1").Build()),
-            csharpLanguageVersion: default);
+        var projectWorkspaceState1 = ProjectWorkspaceState.Create(ImmutableArray.Create(
+            TagHelperDescriptorBuilder.Create("test1", "TestAssembly1").Build()));

        _projectSnapshot1 = new ProjectSnapshot(
            ProjectState.Create(
-                _workspace.Services,
+                projectEngineFactory,
                new HostProject("/host/path/to/project1.csproj", "/host/path/to/obj", RazorConfiguration.Default, "project1"),
                projectWorkspaceState1));

-        var projectWorkspaceState2 = new ProjectWorkspaceState(ImmutableArray.Create(
-            TagHelperDescriptorBuilder.Create("test2", "TestAssembly2").Build()),
-            csharpLanguageVersion: default);
+        var projectWorkspaceState2 = ProjectWorkspaceState.Create(ImmutableArray.Create(
+            TagHelperDescriptorBuilder.Create("test2", "TestAssembly2").Build()));

        _projectSnapshot2 = new ProjectSnapshot(
            ProjectState.Create(
-                _workspace.Services,
+                projectEngineFactory,
                new HostProject("/host/path/to/project2.csproj", "/host/path/to/obj", RazorConfiguration.Default, "project2"),
                projectWorkspaceState2));
    }
@ -196,13 +193,9 @@ public class DefaultProjectSnapshotManagerProxyTest : ProjectSnapshotManagerDisp
        Assert.Same(state1, state2);
    }

-    private class TestProjectSnapshotManager : ProjectSnapshotManager
+    private class TestProjectSnapshotManager(params IProjectSnapshot[] projects) : ProjectSnapshotManager
    {
-        private ImmutableArray<IProjectSnapshot> _projects;
-        public TestProjectSnapshotManager(params IProjectSnapshot[] projects)
-        {
-            _projects = projects.ToImmutableArray();
-        }
+        private ImmutableArray<IProjectSnapshot> _projects = projects.ToImmutableArray();

        public override ImmutableArray<IProjectSnapshot> GetProjects() => _projects;

--- a/src/Razor/test/Microsoft.VisualStudio.LiveShare.Razor.Test/SerializationTest.cs
+++ b/src/Razor/test/Microsoft.VisualStudio.LiveShare.Razor.Test/SerializationTest.cs
@ -13,13 +13,8 @@ using Xunit.Abstractions;

 namespace Microsoft.VisualStudio.LiveShare.Razor;

-public class SerializationTest : ToolingTestBase
+public class SerializationTest(ITestOutputHelper testOutput) : ToolingTestBase(testOutput)
 {
-    public SerializationTest(ITestOutputHelper testOutput)
-        : base(testOutput)
-    {
-    }
-
    [Fact]
    public void ProjectSnapshotHandleProxy_RoundTripsProperly()
    {
@ -28,7 +23,7 @@ public class SerializationTest : ToolingTestBase
            TagHelperDescriptorBuilder.Create("TestTagHelper", "TestAssembly").Build(),
            TagHelperDescriptorBuilder.Create("TestTagHelper2", "TestAssembly2").Build());

-        var projectWorkspaceState = new ProjectWorkspaceState(tagHelpers, default);
+        var projectWorkspaceState = ProjectWorkspaceState.Create(tagHelpers);
        var expectedConfiguration = RazorConfiguration.Default;
        var expectedRootNamespace = "project";
        var handle = new ProjectSnapshotHandleProxy(new Uri("vsls://some/path/project.csproj"), new Uri("vsls://some/path/obj"), RazorConfiguration.Default, expectedRootNamespace, projectWorkspaceState);