Create new test for Get-Credential which requires module to create a test host

test/powershell/Modules/Microsoft.PowerShell.Security/GetCredential.Tests.ps1

@@ -0,0 +1,31 @@
+if ( ! (get-module -ea silentlycontinue TestHostCS ))
+{
+    $root = git rev-parse --show-toplevel
+    $pestertestroot = join-path $root test/powershell
+    $common = join-path $pestertestroot Common
+    $hostmodule = join-path $common TestHostCS.psm1
+    import-module $hostmodule
+}
+Describe "Get-Credential Test" -tag "CI" {
+    BeforeAll {
+        $th = New-TestHost
+        $th.UI.StringForSecureString = "This is a test"
+        $rs = [runspacefactory]::Createrunspace($th)
+        $rs.open()
+        $ps = [powershell]::Create()
+        $ps.Runspace = $rs
+        $ps.Commands.Clear()
+    }
+    AfterAll {
+        $rs.Close()
+        $rs.Dispose()
+        $ps.Dispose()
+    }
+    It "Get-Credential produces as credential object" {
+        $cred = $ps.AddScript("Get-Credential -User Joe -Message Foo").Invoke() | Select-Object -First 1
+        $cred.gettype().FullName | Should Be "System.Management.Automation.PSCredential"
+        $netcred = $cred.GetNetworkCredential()
+        $netcred.UserName | Should be "Joe"
+        $netcred.Password | Should be "this is a test"
+    }
+}