Update Get/Set-ExecutionPolicy tests

Test expected behaviors on both Windows and Linux.

test/powershell/ExecutionPolicy.Tests.ps1

@@ -0,0 +1,34 @@
+Describe "ExecutionPolicy" {
+    # We check against Windows because Linux and OS X behavior is the same
+    $isWindows = [System.Runtime.InteropServices.RuntimeInformation]::IsOSPlatform([System.Runtime.InteropServices.OSPlatform]::Windows)
+
+    Context "Check Get-ExecutionPolicy behavior" {
+	It "Should throw PlatformNotSupported when not on Windows" {
+	    if (!$isWindows) {
+		{ Get-ExecutionPolicy } | Should Throw "Operation is not supported on this platform."
+	    }
+	}
+
+	It "Should return Microsoft.Powershell.ExecutionPolicy PSObject on Windows" {
+	    if ($isWindows) {
+		(Get-ExecutionPolicy).GetType() | Should Be Microsoft.Powershell.ExecutionPolicy
+	    }
+	}
+    }
+
+    Context "Check Set-ExecutionPolicy behavior" {
+	It "Should throw PlatformNotSupported when not on Windows" {
+	    if (!$isWindows) {
+		{ Set-ExecutionPolicy Unrestricted } | Should Throw "Operation is not supported on this platform."
+	    }
+	}
+
+	It "Should succeed on Windows" {
+	    if ($isWindows) {
+		# We use the Process scope to avoid affecting the system
+		# Unrestricted is assumed "safe", otherwise these tests would not be running
+		{ Set-ExecutionPolicy -Force -Scope Process -ExecutionPolicy Unrestricted } | Should Not Throw
+	    }
+	}
+    }
+}

test/powershell/Get-ExecutionPolicy.Tests.ps1

@@ -1,10 +0,0 @@
-Describe "Get-ExecutionPolicy"{
-
-    Context "Check return type of Get-ExecutionPolicy"{
-
-	It "Should return Microsoft.Powershell.ExecutionPolicy PSObject"{
-	    (Get-ExecutionPolicy).GetType() | Should Be Microsoft.Powershell.ExecutionPolicy	
-	}
-
-    } 
-}