Fix severity ignore case bug

Author: yutingc

Engine/Commands/GetScriptAnalyzerRuleCommand.cs

@@ -142,7 +142,7 @@ protected override void ProcessRecord()
             {
                 if (severity != null)
                 {
-                    var ruleSeverity = severity.Select(item => Enum.Parse(typeof (RuleSeverity), item));
+                    var ruleSeverity = severity.Select(item => Enum.Parse(typeof (RuleSeverity), item, true));
                     rules = rules.Where(item => ruleSeverity.Contains(item.GetSeverity())).ToList();
                 }
 

Engine/Commands/InvokeScriptAnalyzerCommand.cs

@@ -601,7 +601,7 @@ private void AnalyzeFile(string filePath)
 
             if (severity != null)
             {
-                var diagSeverity = severity.Select(item => Enum.Parse(typeof(DiagnosticSeverity), item));
+                var diagSeverity = severity.Select(item => Enum.Parse(typeof(DiagnosticSeverity), item, true));
                 diagnostics = diagnostics.Where(item => diagSeverity.Contains(item.Severity)).ToList();
             }
 

Tests/Engine/GetScriptAnalyzerRule.tests.ps1

@@ -113,12 +113,17 @@ Describe "Test RuleExtension" {
 Describe "TestSeverity" {
     It "filters rules based on the specified rule severity" {
         $rules = Get-ScriptAnalyzerRule -Severity Error
-        $rules.Count | Should be 4
+        $rules.Count | Should be 6
     }
 
     It "filters rules based on multiple severity inputs"{
         $rules = Get-ScriptAnalyzerRule -Severity Error,Information
-        $rules.Count | Should be 8
+        $rules.Count | Should be 9
+    }
+
+        It "takes lower case inputs" {
+        $rules = Get-ScriptAnalyzerRule -Severity error
+        $rules.Count | Should be 6
     }
 }
 
@@ -130,6 +135,6 @@ Describe "TestWildCard" {
 
     It "filters rules based on wild card input and severity"{
         $rules = Get-ScriptAnalyzerRule -Name PSDSC*　-Severity Information
-        $rules.Count | Should be 2
+        $rules.Count | Should be 1
     }
 }

Tests/Engine/InvokeScriptAnalyzer.tests.ps1

@@ -169,6 +169,11 @@ Describe "Test Severity" {
             $errors = Invoke-ScriptAnalyzer $directory\TestScript.ps1 -Severity Information, Warning
             $errors.Count | Should Be 2
         }
+
+        It "works with lowercase argument"{
+             $errors = Invoke-ScriptAnalyzer $directory\TestScript.ps1 -Severity information, warning
+            $errors.Count | Should Be 2
+        }
     }
 
     Context "When used incorrectly" {