Update use of clang PowerShell

scripts/psClang/visualstudio-detection.tests.ps1

@@ -0,0 +1,73 @@
+#Clear-Host
+
+# IMPORT code blocks
+
+Set-Variable -name "kScriptLocation"                                              `
+             -value (Split-Path -Path $MyInvocation.MyCommand.Definition -Parent) <#`
+             -option Constant#>
+
+@(
+ , "$kScriptLocation\io.ps1"
+ , "$kScriptLocation\visualstudio-detection.ps1"
+ ) | ForEach-Object { . $_ }
+
+Describe "Visual Studio detection" {
+  # Mock script parameters
+  $global:cptVisualStudioVersion = "2017"
+  $aVisualStudioSku     = "Professional"
+
+  It "Get-MscVer" {
+    [string[]] $mscVer = Get-MscVer
+    $mscVer.Count | Should -BeExactly 1
+    $mscVer[0] | Should -Not -BeNullOrEmpty
+    $mscVer[0].Length | Should -BeGreaterThan 3
+    $mscVer[0].Contains(".") | Should -BeExactly $true
+  }
+
+  It "Get-VisualStudio-Path" {
+    $vsPath = Get-VisualStudio-Path
+    $vsPath | Should -Not -BeNullOrEmpty
+  }
+
+  It "Get-VisualStudio-Path [2015]" {
+    # see first if VS 2015 is installed
+    [Microsoft.Win32.RegistryKey] $vs14Key = Get-Item "HKLM:SOFTWARE\Wow6432Node\Microsoft\VisualStudio\14.0"
+    [bool] $vs2015isInstalled = $vs14Key -and ![string]::IsNullOrEmpty($vs14Key.GetValue("InstallDir"))
+
+    $oldMockValue = $global:cptVisualStudioVersion
+
+    $vsPath = Get-VisualStudio-Path
+    $vsPath | Should -Not -BeNullOrEmpty
+
+    # Re-Mock script parameter
+    $global:cptVisualStudioVersion = "2015"
+
+    # Maybe we have a VS 2017 installation with v140 toolset installed
+    [string] $vs2017ToolsetV140Path = "${Env:ProgramFiles(x86)}\Microsoft Visual Studio 14.0"
+    if (Test-Path "$vs2017ToolsetV140Path\VC\include\iostream")
+    {
+      $vs2015isInstalled = $true
+    }
+
+    if ($vs2015isInstalled)
+    {
+      $vs2015Path = Get-VisualStudio-Path
+      $vs2015Path | Should -Not -BeNullOrEmpty
+      $vs2015Path | Should -Not -Be $vsPath
+    }
+    else
+    {
+      { Get-VisualStudio-Path } | Should -Throw
+    }
+
+    $global:cptVisualStudioVersion = $oldMockValue
+  }
+
+  It "Get-VisualStudio-Includes" {
+    [string] $vsPath = Get-VisualStudio-Path
+    [string] $mscver = Get-MscVer
+    [string[]] $includes = Get-VisualStudio-Includes -vsPath $vsPath -mscVer $mscver
+    $includes.Count | Should -BeGreaterThan 1
+    $includes | ForEach-Object { [System.IO.Directory]::Exists($_) | Should -BeExactly $true }
+  }
+}