Add Update-TypeData and Update-FormatData Pester Unit Test

test/powershell/Update-FormatData.Tests.ps1

@@ -1,15 +1,50 @@
-Describe "Update-FormatData" {
-
-    Context "Validate Update-FormatData update correctly" {
-
-	It "Should not throw upon reloading previous formatting file" {
-	    { Update-FormatData } | Should Not throw
-	}
-
-	It "Should validly load formatting data" {
-	    { Get-FormatData -typename System.Diagnostics.Process | Export-FormatData -Path "outputfile.ps1xml" }
-	    { Update-FormatData -prependPath "outputfile.ps1xml" | Should Not throw }
-	    { Remove-Item "outputfile.ps1xml" -ErrorAction SilentlyContinue }
-	}
-    }
-}
+Describe "Update-FormatData" {
+
+    Context "Validate Update-FormatData update correctly" {
+
+	It "Should not throw upon reloading previous formatting file" {
+	    { Update-FormatData } | Should Not throw
+	}
+
+	It "Should validly load formatting data" {
+	    { Get-FormatData -typename System.Diagnostics.Process | Export-FormatData -Path "outputfile.ps1xml" }
+	    { Update-FormatData -prependPath "outputfile.ps1xml" | Should Not throw }
+	    { Remove-Item "outputfile.ps1xml" -ErrorAction SilentlyContinue }
+	}
+    }
+}
+
+Describe "Update-FormatData basic functionality" -Tags DRT{
+	$tmpDirectory = $TestDrive
+    $testfilename = "testfile.ps1xml"
+    $testfile = Join-Path -Path $tmpDirectory -ChildPath $testfilename
+	
+	It "Update-FormatData with WhatIf should work"{
+		$xmlContent=@"
+                <Types>
+                    <Type>
+                        <Name>AnyName</Name>
+                        <Members>
+                            <PropertySet>
+                                <Name>PropertySetName</Name>
+                                <ReferencedProperties>
+                                    <Name>FirstName</Name> 
+                                    <Name>LastName</Name> 
+                                </ReferencedProperties>
+                            </PropertySet>
+                        </Members>
+                    </Type>
+                </Types>
+"@
+		$xmlContent>$testfile
+		try
+		{
+			{Update-FormatData -Append $testfile -WhatIf} | Should Not Throw
+			{Update-FormatData -Prepend $testfile -WhatIf} | Should Not Throw
+		}
+		finally
+		{
+			rm $testfile
+		}
+	}
+}