diff --git a/src/vs/workbench/test/electron-browser/api/extHostDocumentData.test.ts b/src/vs/workbench/test/electron-browser/api/extHostDocumentData.test.ts
index d4a3a7a422f55156493d2c233a39e2a3cf8dbe43..b89cbfe82dd8d6b580ca460e88a474128f02e15d 100644
--- a/src/vs/workbench/test/electron-browser/api/extHostDocumentData.test.ts
+++ b/src/vs/workbench/test/electron-browser/api/extHostDocumentData.test.ts
@@ -42,18 +42,18 @@ suite('ExtHostDocumentData', () => {
 	});
 
 	test('readonly-ness', function () {
-		assert.throws(() => (<any>data).document.uri = null);
-		assert.throws(() => (<any>data).document.fileName = 'foofile');
-		assert.throws(() => (<any>data).document.isDirty = false);
-		assert.throws(() => (<any>data).document.isUntitled = false);
-		assert.throws(() => (<any>data).document.languageId = 'dddd');
-		assert.throws(() => (<any>data).document.lineCount = 9);
+		assert.throws((): void => (data as any).document.uri = null);
+		assert.throws(() => (data as any).document.fileName = 'foofile');
+		assert.throws(() => (data as any).document.isDirty = false);
+		assert.throws(() => (data as any).document.isUntitled = false);
+		assert.throws(() => (data as any).document.languageId = 'dddd');
+		assert.throws(() => (data as any).document.lineCount = 9);
 	});
 
 	test('save, when disposed', function () {
 		let saved: URI;
 		let data = new ExtHostDocumentData(new class extends mock<MainThreadDocumentsShape>() {
-			$trySaveDocument(uri) {
+			$trySaveDocument(uri: URI) {
 				assert.ok(!saved);
 				saved = uri;
 				return TPromise.as(true);
diff --git a/src/vs/workbench/test/electron-browser/api/mock.ts b/src/vs/workbench/test/electron-browser/api/mock.ts
index 622f52cade37670c43d983f6639f07eb24575595..9e8c56e11bc4fe4a0959e46154f1b1a9ff43214e 100644
--- a/src/vs/workbench/test/electron-browser/api/mock.ts
+++ b/src/vs/workbench/test/electron-browser/api/mock.ts
@@ -10,5 +10,5 @@ export interface Ctor<T> {
 }
 
 export function mock<T>(): Ctor<T> {
-	return <any>function () { };
+	return function () { } as any;
 }