xunit/xunit#2859: Update xUnit2013 to stop warning about .Count check with StringValues

src/xunit.analyzers.tests/Analyzers/X2000/AssertEqualShouldNotBeUsedForCollectionSizeCheckTests.cs

@@ -5,9 +5,10 @@ using Verify = CSharpVerifier<Xunit.Analyzers.AssertEqualShouldNotBeUsedForColle
 
 public class AssertEqualShouldNotBeUsedForCollectionSizeCheckTests
 {
-	public static TheoryData<string> CollectionsWithExceptionThrowingGetEnumeratorMethod = new()
+	public static TheoryData<string> AllowedCollections = new()
 	{
 		"new System.ArraySegment<int>().Count",
+		"Microsoft.Extensions.Primitives.StringValues.Empty.Count",
 	};
 
 	public static TheoryData<string> Collections = new()
@@ -42,8 +43,8 @@ public class AssertEqualShouldNotBeUsedForCollectionSizeCheckTests
 	};
 
 	[Theory]
-	[MemberData(nameof(CollectionsWithExceptionThrowingGetEnumeratorMethod))]
-	public async void DoesNotFindWarningForCollectionsWithExceptionThrowingGetEnumeratorMethod(string collection)
+	[MemberData(nameof(AllowedCollections))]
+	public async void AllowedCollection_DoesNotTrigger(string collection)
 	{
 		var source = $@"
 using System.Linq;

src/xunit.analyzers.tests/Utility/CodeAnalyzerHelper.cs

@@ -31,6 +31,7 @@ static class CodeAnalyzerHelper
 
 		CurrentXunitV2 = defaultAssemblies.AddPackages(
 			ImmutableArray.Create(
+				new PackageIdentity("Microsoft.Extensions.Primitives", "8.0.0"),
 				new PackageIdentity("System.Collections.Immutable", "1.6.0"),
 				new PackageIdentity("System.Threading.Tasks.Extensions", "4.5.4"),
 				new PackageIdentity("xunit.abstractions", "2.0.3"),
@@ -41,6 +42,7 @@ static class CodeAnalyzerHelper
 
 		CurrentXunitV2RunnerUtility = defaultAssemblies.AddPackages(
 			ImmutableArray.Create(
+				new PackageIdentity("Microsoft.Extensions.Primitives", "8.0.0"),
 				new PackageIdentity("System.Collections.Immutable", "1.6.0"),
 				new PackageIdentity("System.Threading.Tasks.Extensions", "4.5.4"),
 				new PackageIdentity("xunit.abstractions", "2.0.3"),
@@ -51,6 +53,7 @@ static class CodeAnalyzerHelper
 		CurrentXunitV3 = defaultAssemblies.AddPackages(
 			ImmutableArray.Create(
 				new PackageIdentity("Microsoft.Bcl.AsyncInterfaces", "8.0.0"),
+				new PackageIdentity("Microsoft.Extensions.Primitives", "8.0.0"),
 				new PackageIdentity("System.Threading.Tasks.Extensions", "4.5.4"),
 				new PackageIdentity("System.Text.Json", "8.0.0"),
 				new PackageIdentity("xunit.v3.assert", "0.1.1-pre.342"),
@@ -62,6 +65,7 @@ static class CodeAnalyzerHelper
 		CurrentXunitV3RunnerUtility = defaultAssemblies.AddPackages(
 			ImmutableArray.Create(
 				new PackageIdentity("Microsoft.Bcl.AsyncInterfaces", "8.0.0"),
+				new PackageIdentity("Microsoft.Extensions.Primitives", "8.0.0"),
 				new PackageIdentity("System.Threading.Tasks.Extensions", "4.5.4"),
 				new PackageIdentity("System.Text.Json", "8.0.0"),
 				new PackageIdentity("xunit.v3.common", "0.1.1-pre.342"),

src/xunit.analyzers.tests/xunit.analyzers.tests.csproj

@@ -8,6 +8,7 @@
   <ItemGroup>
     <!-- Download packages referenced by CodeAnalyzerHelper -->
     <PackageDownload Include="Microsoft.Bcl.AsyncInterfaces" Version="[8.0.0]" />
+    <PackageDownload Include="Microsoft.Extensions.Primitives" Version="[8.0.0]" />
     <PackageDownload Include="System.Collections.Immutable" Version="[1.6.0]" Condition=" '$(TargetFramework)' == 'net472' " />
     <PackageDownload Include="System.Text.Json" Version="[8.0.0]" />
     <PackageDownload Include="System.Threading.Tasks.Extensions" Version="[4.5.4]" />

src/xunit.analyzers/X2000/AssertEqualShouldNotBeUsedForCollectionSizeCheck.cs

@@ -13,9 +13,12 @@ namespace Xunit.Analyzers;
 [DiagnosticAnalyzer(LanguageNames.CSharp)]
 public class AssertEqualShouldNotBeUsedForCollectionSizeCheck : AssertUsageAnalyzerBase
 {
-	static readonly HashSet<string> collectionTypesWithExceptionThrowingGetEnumeratorMethod = new()
+	static readonly HashSet<string> allowedCollections = new()
 	{
+		// ArraySegment<T>.GetEnumerator() can throw
 		"System.ArraySegment<T>",
+		// StringValues has an implicit string conversion that's preferred by the compiler, https://github.com/xunit/xunit/issues/2859
+		"Microsoft.Extensions.Primitives.StringValues",
 	};
 	static readonly HashSet<string> sizeMethods = new()
 	{
@@ -73,7 +76,7 @@ public class AssertEqualShouldNotBeUsedForCollectionSizeCheck : AssertUsageAnaly
 		if (symbol is null)
 			return;
 
-		if (IsCollectionsWithExceptionThrowingGetEnumeratorMethod(symbol) ||
+		if (IsAllowedCollection(symbol) ||
 				!IsWellKnownSizeMethod(symbol) &&
 				!IsICollectionCountProperty(context, symbol) &&
 				!IsICollectionOfTCountProperty(context, symbol) &&
@@ -114,8 +117,8 @@ public class AssertEqualShouldNotBeUsedForCollectionSizeCheck : AssertUsageAnaly
 		return methodName == Constants.Asserts.Equal ? Constants.Asserts.Empty : Constants.Asserts.NotEmpty;
 	}
 
-	static bool IsCollectionsWithExceptionThrowingGetEnumeratorMethod(ISymbol symbol) =>
-		collectionTypesWithExceptionThrowingGetEnumeratorMethod.Contains(symbol.ContainingType.ConstructedFrom.ToDisplayString());
+	static bool IsAllowedCollection(ISymbol symbol) =>
+		allowedCollections.Contains(symbol.ContainingType.ConstructedFrom.ToDisplayString());
 
 	static bool IsWellKnownSizeMethod(ISymbol symbol) =>
 		sizeMethods.Contains(symbol.OriginalDefinition.ToDisplayString());