Fix TravisCI build

.travis.yml

@@ -1,12 +1,4 @@
----
-sudo: false
-language: c++
-# dotnet cli require Ubuntu 14.04
-sudo: required
-dist: trusty
-
-# dotnet cli require OSX 10.10
-osx_image: xcode7.1
+language: generic
 
 addons:
   apt:
@@ -18,32 +10,39 @@ addons:
     - libunwind8
     - zlib1g
 
-os:
-  - osx
-  - linux
-
-env:
-  matrix:
-    - CLI_VERSION: Latest
-      Configuration: Debug
-    - CLI_VERSION: Latest
-      Configuration: Release
+matrix:
+  include:
+    - os: linux
+      dist: trusty # Ubuntu 14.04
+      sudo: required
+      env: CONFIGURATION=Debug
+    - os: linux
+      dist: trusty
+      sudo: required
+      env: CONFIGURATION=Release
+    - os: osx
+      osx_image: xcode7.2 # macOS 10.11
+      env: CONFIGURATION=Debug
+    - os: osx
+      osx_image: xcode7.2
+      env: CONFIGURATION=Release
 
 before_install:
   # Install OpenSSL
   - if test "$TRAVIS_OS_NAME" == "osx"; then
-      brew update;
       brew install openssl;
       brew link --force openssl;
+      export DOTNET_SDK_URL="https://go.microsoft.com/fwlink/?LinkID=809128";
+    else
+      export DOTNET_SDK_URL="https://go.microsoft.com/fwlink/?LinkID=809129";
     fi
 
-  # Download script to install dotnet cli
-  - curl -L --create-dirs https://raw.githubusercontent.com/dotnet/cli/rel/1.0.0/scripts/obtain/dotnet-install.sh -o ./scripts/install.sh
-
   - export DOTNET_INSTALL_DIR="$PWD/.dotnetcli"
 
-  # Install the latest versio of dotnet CLI
-  - bash ./scripts/install.sh --version "$CLI_VERSION" --install-dir "$DOTNET_INSTALL_DIR" --no-path
+  # Install .NET CLI
+  - mkdir $DOTNET_INSTALL_DIR
+  - curl -L $DOTNET_SDK_URL -o dotnet_package
+  - tar -xvzf dotnet_package -C $DOTNET_INSTALL_DIR
 
   # Add dotnet to PATH
   - export PATH="$DOTNET_INSTALL_DIR:$PATH"
@@ -59,12 +58,65 @@ install:
       exit 1;
     fi
 
+  # [WORKAROUND]
+  #
+  # SYNOPSIS:
+  #
+  # dotnet-cli has introduced a bug with .NET Core RTM (wasn't there till RC2);
+  # that is, the dotnet-run command ignores --framework option and therefore
+  # demands mono PCL reference assemblies to be present on Unix systems, even
+  # though when we intend to build for netcoreapp or netstandard TxM.
+  #
+  # See: https://github.com/dotnet/cli/issues/3658
+  #
+  # The workaround is to rewrite the JSON without net451 framework node in the
+  # runnable (or testable) project's JSON file for CI. This work around must be
+  # applied before executing dotnet-restore command.
+  #
+  # Written in JavaScript to be executable with node.js
+  # (JavaScript being the most native langauge for JSON processing)
+  #
+  # Travis CI job when running under different langauge provides nvm (the node.js version manager)
+  # but not node.js itself. So we first run:
+  #
+  # > $HOME/.nvm/nvm.sh
+  #
+  # then install stable node
+  #
+  # > nvm install stable && nvm use stable
+  #
+  # now, we have node.js in PATH. We will run the following program in evaluation
+  # mode as one-liner:
+  #
+  # ```javascript
+  # // the file to manipulate
+  # jsonPath = './test/NUnit.Portable.Agent.Tests/project.json';
+  #
+  # // read and parse JSON as object (aka CommonJS magic)
+  # data = require(jsonPath);
+  #
+  # // FileSystem API handle
+  # fs = require('fs');
+  #
+  # // delete framework 45 key from the object
+  # delete data.frameworks.net45;
+  #
+  # // write back to file
+  # fs.writeFileSync(jsonPath, JSON.stringify(data, null, 2));
+  # ```
+  # Now the actual one-liner (compressed) version:
+  #
+  - if test "$TRAVIS_OS_NAME" == "linux"; then
+      nvm install stable && nvm use stable;
+    fi
+  - node -e "jsonPath='./test/NUnit.Portable.Agent.Tests/project.json';data=require(jsonPath);fs=require('fs');delete data.frameworks.net45;fs.writeFileSync(jsonPath, JSON.stringify(data, null, 2))"
+
   # Restore dependencies
   - dotnet restore
 
   # Build projects
-  - dotnet build -c $Configuration -f netcoreapp1.0 ./test/NUnit.Portable.Agent.Tests
+  - dotnet build -c $CONFIGURATION -f netstandard1.3 ./src/NUnit.Portable.Agent
 
 script:
   # Run tests
-  - dotnet run -c $Configuration -f netcoreapp1.0 -p ./test/NUnit.Portable.Agent.Tests
+  - dotnet run -c $CONFIGURATION -f netcoreapp1.0 -p ./test/NUnit.Portable.Agent.Tests