[Windows] Implement new directories hierarchy (#8616)

images/windows/scripts/tests/Vsix.Tests.ps1

@@ -0,0 +1,20 @@
+Describe "Vsix" {
+    $toolset = Get-ToolsetContent
+    $requiredVsixs = $toolset.visualStudio.vsix
+
+    $allPackages = (Get-VisualStudioInstance).Packages
+    $testCases = $requiredVsixs | ForEach-Object {
+        $vsix = Get-VsixExtenstionFromMarketplace -ExtensionMarketPlaceName $_
+        @{
+            VsixName = $vsix.ExtensionName
+            VsixId = $vsix.VsixId
+            AllPackages = $allPackages
+        }
+    }
+    if ($testCases.Count -gt 0) {
+        It "Extension <VsixName> is installed" -TestCases $testCases {
+            $objVsix = $AllPackages | Where-Object { $_.id -eq $VsixId }
+            $objVsix | Should -Not -BeNullOrEmpty
+        }
+    }
+}