Install previous runtimes for SDK tests

test/SdkTests/SdkTests.csproj

@@ -25,6 +25,7 @@
 
   <PropertyGroup>
     <RedistLayoutPath>$(ArtifactsBinDir)redist\$(Configuration)\dotnet\</RedistLayoutPath>
+    <DotnetToTestPath>$(ArtifactsBinDir)redist\$(Configuration)\dotnet-with-previous-runtimes\</DotnetToTestPath>
   </PropertyGroup>
 
   <ItemGroup>
@@ -35,9 +36,53 @@
     <SdkTest Include="Rebuild" />
     <SdkTest Include="Restore" />
     <SdkTest Include="ToolPack" />
+
+    <RuntimeVersionToInstall Include="1.0.5" />
+    <RuntimeVersionToInstall Include="1.1.2" />
+    <RuntimeVersionToInstall Include="2.1.0" />
+    <RuntimeVersionToInstall Include="2.2.4" />
   </ItemGroup>
 
-  <Target Name="RunSdkTests">
+  <Target Name="SetupLayoutWithPreviousRuntimes">
+    <ItemGroup>
+      <LayoutFilesToCopyToDotnetToTest Include="$(RedistLayoutPath)**"/>
+      <LayoutFilesToCopyToDotnetToTest>
+        <DestinationPath>$(DotnetToTestPath)%(RecursiveDir)%(Filename)%(Extension)</DestinationPath>
+      </LayoutFilesToCopyToDotnetToTest>
+    </ItemGroup>
+    <Copy SourceFiles="@(LayoutFilesToCopyToDotnetToTest)"
+          DestinationFiles="@(LayoutFilesToCopyToDotnetToTest->'%(DestinationPath)')"
+          SkipUnchangedFiles="true"/>
+
+    <MSBuild Projects="$(MSBuildProjectFullPath)"
+         Targets="InstallRuntimeToLayout"
+         Properties="RuntimeVersionToInstall=%(RuntimeVersionToInstall.Identity)"
+         BuildInParallel="false"/>
+  </Target>
+
+  <Target Name="InstallRuntimeToLayout">
+    <PropertyGroup>
+      <RuntimeTargetDirectory>$(DotnetToTestPath)shared\Microsoft.NETCore.App\$(RuntimeVersionToInstall)</RuntimeTargetDirectory>
+    </PropertyGroup>
+    <PropertyGroup Condition="'$(OS)' == 'Windows_NT'">
+      <InstallRuntimeCommand>powershell -NoLogo -NoProfile -ExecutionPolicy ByPass</InstallRuntimeCommand>
+      <InstallRuntimeCommand>$(InstallRuntimeCommand) $(_DotNetRoot)dotnet-install.ps1</InstallRuntimeCommand>
+      <InstallRuntimeCommand>$(InstallRuntimeCommand) -Version $(RuntimeVersionToInstall)</InstallRuntimeCommand>
+      <InstallRuntimeCommand>$(InstallRuntimeCommand) -InstallDir $(DotnetToTestPath)</InstallRuntimeCommand>
+      <InstallRuntimeCommand>$(InstallRuntimeCommand) -Runtime "dotnet"</InstallRuntimeCommand>
+    </PropertyGroup>
+    <PropertyGroup Condition="'$(OS)' != 'Windows_NT'">
+      <InstallRuntimeCommand>$(_DotNetRoot)dotnet-install.sh</InstallRuntimeCommand>
+      <InstallRuntimeCommand>$(InstallRuntimeCommand) --version $(RuntimeVersionToInstall)</InstallRuntimeCommand>
+      <InstallRuntimeCommand>$(InstallRuntimeCommand) --install_dir $(DotnetToTestPath)</InstallRuntimeCommand>
+      <InstallRuntimeCommand>$(InstallRuntimeCommand) --runtime "dotnet"</InstallRuntimeCommand>
+    </PropertyGroup>
+
+    <Exec Command="$(InstallRuntimeCommand)"
+          Condition="!Exists($(RuntimeTargetDirectory))"/>
+  </Target>
+
+  <Target Name="RunSdkTests" DependsOnTargets="SetupLayoutWithPreviousRuntimes">
 
     <!-- SDK tests use the $(TEMP)\dotnetSdkTests as the working directory, isolate that from any higher-level
          Directory.Build files (TEMP is set to a folder in the repo when running in CI) -->
@@ -77,7 +122,7 @@
       <ResultsStdOutPath>$(ArtifactsLogDir)$(TestProjectName).log</ResultsStdOutPath>
 
       <TestArgs>-noautoreporters -noRepoInference</TestArgs>
-      <TestArgs>$(TestArgs) -dotnetPath $(RedistLayoutPath)\dotnet</TestArgs>
+      <TestArgs>$(TestArgs) -dotnetPath $(DotnetToTestPath)\dotnet</TestArgs>
       <TestArgs>$(TestArgs) -xml "$(ResultsXmlPath)"</TestArgs>
       <TestArgs>$(TestArgs) -html "$(ResultsHtmlPath)" $(TestRunnerAdditionalArguments)</TestArgs>
       <TestArgs>$(TestArgs) &gt; $(ResultsStdOutPath)</TestArgs>