fix tests

src/vs/workbench/test/workbenchTestServices.ts

@@ -253,7 +253,7 @@ export function workbenchInstantiationService(): IInstantiationService {
 	instantiationService.stub(IUntitledEditorService, instantiationService.createInstance(UntitledEditorService));
 	instantiationService.stub(IStorageService, new TestStorageService());
 	instantiationService.stub(IPartService, new TestPartService());
-	instantiationService.stub(IModeService, ModeServiceImpl);
+	instantiationService.stub(IModeService, instantiationService.createInstance(ModeServiceImpl));
 	instantiationService.stub(IHistoryService, new TestHistoryService());
 	instantiationService.stub(ITextResourcePropertiesService, new TestTextResourcePropertiesService(configService));
 	instantiationService.stub(IModelService, instantiationService.createInstance(ModelServiceImpl));