Add a test

Author: adityapatwardhan

test/ConstrainedLanguageMode.Tests.ps1

@@ -0,0 +1,10 @@
+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.
+
+# In future, we will add more tests to be executed in Constrained Language Mode.
+Describe "Test UserAgentInfo" {
+    It "GetUserString returns a non-null, non-empty string" {
+        $userAgentString = [Microsoft.PowerShell.PSResourceGet.InternalHooks]::GetUserString()
+        $userAgentString | Should -Not -BeNullOrEmpty
+    }
+}