improve vscode tests perf (#43767)

.vscode/tasks.json

@@ -125,6 +125,8 @@
           "${workspaceRoot}/scripts/vscode-run-tests.ps1",
           "-filePath",
           "${file}",
+          "-msbuildEngine",
+          "dotnet",
           "-framework",
           "netcoreapp3.1",
           "-filter",
@@ -142,6 +144,8 @@
           "${workspaceRoot}/scripts/vscode-run-tests.ps1",
           "-filePath",
           "${file}",
+          "-msbuildEngine",
+          "dotnet",
           "-framework",
           "netcoreapp3.1"
         ],

scripts/vscode-build.ps1

 param (
   [Parameter(Mandatory = $true)][string]$filePath,
-  [string]$msbuildEngine = "vs"
+  [string]$msbuildEngine = "vs",
+  [string]$framework = ""
 )
 
 Set-StrictMode -version 3.0
@@ -12,7 +13,8 @@ $fileInfo = Get-ItemProperty $filePath
 $projectFileInfo = Get-ProjectFile $fileInfo
 if ($projectFileInfo) {
   $buildTool = InitializeBuildTool
-  $buildArgs = "$($buildTool.Command) -v:m -m -p:UseRoslynAnalyzers=false -p:GenerateFullPaths=true $($projectFileInfo.FullName)"
+  $frameworkArg = if ($framework -ne "") { " -p:TargetFramework=$framework" } else { "" }
+  $buildArgs = "$($buildTool.Command) -v:m -m -p:UseRoslynAnalyzers=false -p:GenerateFullPaths=true$frameworkArg $($projectFileInfo.FullName)"
 
   Write-Host "$($buildTool.Path) $buildArgs"
   Exec-Console $buildTool.Path $buildArgs

scripts/vscode-run-tests.ps1

 param (
   [Parameter(Mandatory = $true)][string]$filePath,
-  [Parameter(Mandatory = $false)][string]$framework,
-  [Parameter(Mandatory = $false)][string]$filter
+  [string]$msbuildEngine = "vs",
+  [string]$framework = $null,
+  [string]$filter = ""
 )
 
 Set-StrictMode -version 3.0
@@ -9,6 +10,10 @@ $ErrorActionPreference = "Stop"
 
 . (Join-Path $PSScriptRoot "../eng/build-utils.ps1")
 
+# Run a build
+. (Join-Path $PSScriptRoot "./vscode-build.ps1") -filePath $filePath -framework $framework -msbuildEngine $msbuildEngine
+Write-Output ""
+
 $fileInfo = Get-ItemProperty $filePath
 $projectFileInfo = Get-ProjectFile $fileInfo
 if ($projectFileInfo) {
@@ -23,9 +28,9 @@ if ($projectFileInfo) {
   $resultsPath = Resolve-Path (New-Item -ItemType Directory -Force -Path $resultsPath) -Relative
 
   # Remove old run logs with the same prefix
-  Remove-Item (Join-Path $resultsPath "$logFilePrefix*.html")
+  Remove-Item (Join-Path $resultsPath "$logFilePrefix*.html") -ErrorAction SilentlyContinue
 
-  $invocation = "$dotnetPath test $projectDir" + $filterArg + $frameworkArg + " --logger `"html;LogFilePrefix=$logfilePrefix`" --results-directory $resultsPath"
+  $invocation = "$dotnetPath test $projectDir" + $filterArg + $frameworkArg + " --logger `"html;LogFilePrefix=$logfilePrefix`" --results-directory $resultsPath --no-build"
   Write-Output "> $invocation"
   Invoke-Expression $invocation