Added test for -Severity parameter in Get-ScriptAnalyzerRule

Author: yutingc

Tests/Engine/GetScriptAnalyzerRule.tests.ps1

@@ -108,4 +108,16 @@ Describe "Test RuleExtension" {
         }
 
     }
+}
+
+Describe "TestSeverity" {
+    It "filters rules based on the specified rule severity" {
+        $rules = Get-ScriptAnalyzerRule -Severity Error
+        $rules.Count | Should be 4
+    }
+
+    It "filters rules based on multiple severity inputs"{
+        $rules = Get-ScriptAnalyzerRule -Severity Error,Information
+        $rules.Count | Should be 8
+    }
 }