Add tests to verify Range parameters

Author: Kapil Borle

Engine/Commands/InvokeFormatterCommand.cs

@@ -133,7 +133,10 @@ private void SetRange()
                 return;
             }
 
-            var range = Range as Range;
+            // When the range object is constructed with `[range]::new syntax`, `Range as Range` cast works.
+            // However, if the range object is constructed with `new-object "range"` syntax, then
+            // we need to use the ImmediatedBaseObject property to cast.
+            var range = (Range as Range ?? (Range as PSObject)?.ImmediateBaseObject as Range);
             if (range != null)
             {
                 this.range = range;

Tests/Engine/InvokeFormatter.tests.ps1

@@ -31,6 +31,46 @@ function foo {
             Invoke-Formatter $def $settings | Should Be $expected
         }
     }
+
+    Context "When a range is given" {
+        It "Should format only within the range when a range list is given" {
+            $def = @"
+function foo {
+"xyz"
+"abc"
+}
+"@
+
+            $expected = @"
+function foo {
+"xyz"
+    "abc"
+}
+"@
+
+            Invoke-Formatter -ScriptDefinition $def -Range @(3, 1, 4, 1) | Should Be $expected
+        }
+
+        It "Should format only within the range when a range object is given" {
+            $def = @"
+function foo {
+"xyz"
+"abc"
+}
+"@
+
+            $expected = @"
+function foo {
+"xyz"
+    "abc"
+}
+"@
+
+            $range = New-Object -TypeName "Microsoft.Windows.PowerShell.ScriptAnalyzer.Range" -ArgumentList 3, 1, 4, 1
+            Invoke-Formatter -ScriptDefinition $def -Range $range | Should Be $expected
+        }
+    }
+
     Context "When no settings are given" {
         It "Should format using default settings" {
             $def = @'