diff --git a/src/vs/workbench/test/electron-browser/api/extHostLanguageFeatures.test.ts b/src/vs/workbench/test/electron-browser/api/extHostLanguageFeatures.test.ts
index eaed58459108b84b004be2a738c89e56848a3fb4..49a7be6f3ddde4781d38163be7ec0eed70fc3ab0 100644
--- a/src/vs/workbench/test/electron-browser/api/extHostLanguageFeatures.test.ts
+++ b/src/vs/workbench/test/electron-browser/api/extHostLanguageFeatures.test.ts
@@ -733,24 +733,40 @@ suite('ExtHostLanguageFeatures', function () {
 
 	// --- rename
 
-	test('Rename, evil provider 1/2', function () {
+	test('Rename, evil provider 0/2', function () {
 
 		disposables.push(extHost.registerRenameProvider(defaultSelector, <vscode.RenameProvider>{
 			provideRenameEdits(): any {
-				throw Error('evil');
+				throw new class Foo { };
 			}
 		}));
 
 		return threadService.sync().then(() => {
 
 			return rename(model, new EditorPosition(1, 1), 'newName').then(value => {
-				throw new Error('');
+				throw Error();
 			}, err => {
 				// expected
 			});
 		});
 	});
 
+	test('Rename, evil provider 1/2', function () {
+
+		disposables.push(extHost.registerRenameProvider(defaultSelector, <vscode.RenameProvider>{
+			provideRenameEdits(): any {
+				throw Error('evil');
+			}
+		}));
+
+		return threadService.sync().then(() => {
+
+			return rename(model, new EditorPosition(1, 1), 'newName').then(value => {
+				assert.equal(value.rejectReason, 'evil');
+			});
+		});
+	});
+
 	test('Rename, evil provider 2/2', function () {
 
 		disposables.push(extHost.registerRenameProvider('*', <vscode.RenameProvider>{