Merge pull request #1661 from PowerShell/dongbo/get-pssession

Fix if/def guards to allow engine to load WsMan and Diagnostics snapins by default when RunspaceConfiguration is used to create a runspace

test/powershell/engine/BasicEngine.Tests.ps1

@@ -3,5 +3,14 @@ Describe 'Basic engine APIs' -Tags "CI" {
         It 'can create default instance' {
             [powershell]::Create() | Should Not Be $null
         }
+
+        It "can load the default snapin 'Microsoft.WSMan.Management'" -skip:(-not $IsWindows) {
+            $ps = [powershell]::Create()
+            $ps.AddScript("Get-Command -Name Test-WSMan") > $null
+            
+            $result = $ps.Invoke()
+            $result.Count | Should Be 1
+            $result[0].PSSnapIn.Name | Should Be "Microsoft.WSMan.Management"
+        }
     }
 }