PowerShell · BrucePay · Sep 28, 2018 · Sep 28, 2018
diff --git a/Tests/CompatibilitySession.Tests.ps1 b/Tests/CompatibilitySession.Tests.ps1
@@ -194,14 +194,14 @@ Describe "Test the Windows PowerShell Compatibility Session functions" {
         }
     }
 
-    It "Should mirror directory changes in the compatibility session" {
+    It 'Should mirror directory changes in the compatibility session' {
         # Verify that the initial directories are sync'ed
-        Invoke-WinCommand { $pwd.Path } | Should -BeExactly $pwd.Path
+        Invoke-WinCommand { $pwd.Path } | Should -Be $pwd.Path
         # Change location and verify that the compat session directory also changed
         Push-Location ..
-        Invoke-WinCommand { $pwd.Path } | Should -BeExactly $pwd.Path
+        Invoke-WinCommand { $pwd.Path } | Should -Be $pwd.Path
         # Change back and verify again
         Pop-Location
-        Invoke-WinCommand { $pwd.Path } | Should -BeExactly $pwd.Path
+        Invoke-WinCommand { $pwd.Path } | Should -Be $pwd.Path
     }
 }
diff --git a/Tests/PSModulePath.Tests.ps1 b/Tests/PSModulePath.Tests.ps1
@@ -14,10 +14,23 @@ Describe "Test Add-WindowsPSModulePath cmdlet" {
         $env:PSModulePath = $originalPsModulePath
     }
 
-    It "Validate Windows PSModulePath is added on Core" {
-        $env:PSModulePath | Should -Not -BeLike "*\WindowsPowerShell\*"
+    It 'Validate that the system environment variable PSModulePath components are added to the $ENV:PSModulePath' {
         Add-WindowsPSModulePath | Should -BeNullOrEmpty
+        # a table of the current PSModulePath components
+        [hashtable] $currentPathTable = @{}
+        $env:PSModulePath.split(';').foreach{$currentPathTable[$_] = $true}
         $WindowsPSModulePath = [System.Environment]::GetEnvironmentVariable("psmodulepath", [System.EnvironmentVariableTarget]::Machine)
-        $env:PSModulePath | Should -BeLike "*$WindowsPSModulePath*"
+        $allComponentsInPath = $true
+        # Verify that all of the path components in the machine-scoped PSModulePath are
+        # also in the session module path.
+        foreach ($pc in $WindowsPSModulePath.Split(';'))
+        {
+            if ( -not $currentPathTable.ContainsKey($pc) )
+            {
+                $allComponents = $false
+            }
+        }
+        $allComponents | Should -Be $true:w
+
     }
 }
diff --git a/WindowsCompatibility/WindowsCompatibility.psd1 b/WindowsCompatibility/WindowsCompatibility.psd1
@@ -33,11 +33,12 @@ FunctionsToExport = @(
 AliasesToExport = @('Add-WinPSModulePath')
 PrivateData = @{
     PSData = @{
-        Tags = @('Compatibility', 'Core')
+        Tags = @('Windows PowerShell', 'Compatibility', 'Core')
+        Prerelease = 'RC'
         LicenseUri = 'https://opensource.org/licenses/MIT'
         ProjectUri = 'https://github.com/PowerShell/WindowsCompatibility'
         ReleaseNotes = @'
-This is the first release of this module with the basic commands:
+This is the first release candidate (RC) of this module with the following commands:
     Initialize-WinSession
     Add-WinFunction
     Invoke-WinCommand

diff --git a/WindowsCompatibility/WindowsCompatibility.psm1 b/WindowsCompatibility/WindowsCompatibility.psm1
@@ -733,6 +733,10 @@ function Copy-WinModule
 
 function Add-WindowsPSModulePath
 {
+    [CmdletBinding(SupportsShouldProcess)]
+    [OutputType([void])]
+    param ()
+
     if ($PSVersionTable.PSEdition -eq 'Core' -and -not $IsWindows)
     {
         throw "This cmdlet is only supported on Windows"
@@ -743,6 +747,8 @@ function Add-WindowsPSModulePath
         return
     }
 
+    [bool] $verboseFlag = $PSBoundParameters['Verbose']
+
     $paths =  @(
         $Env:PSModulePath -split [System.IO.Path]::PathSeparator
         "${Env:UserProfile}\Documents\WindowsPowerShell\Modules"
@@ -753,14 +759,25 @@ function Add-WindowsPSModulePath
     )
 
     $pathTable = [ordered] @{}
+    $doUpdate = $false
     foreach ($path in $paths)
     {
         if ($pathTable[$path])
         {
             continue
         }
+
+        if ($PSCmdlet.ShouldProcess($path, "Add to PSModulePath"))
+        {
+            Write-Verbose -Verbose:$verboseFlag "Adding '$path' to the PSModulePath."
+            $doUpdate = $true
+        }
+
         $pathTable[$path] = $true
     }
 
-    $Env:PSModulePath = $pathTable.Keys -join [System.IO.Path]::PathSeparator
+    if ($doUpdate)
+    {
+        $Env:PSModulePath = $pathTable.Keys -join [System.IO.Path]::PathSeparator
+    }
 }