License header on new file

Author: Matt Carroll

packages/datafile-manager/__test__/testUtils.ts

@@ -1,3 +1,19 @@
+/**
+ * Copyright 2019, Optimizely
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 export function advanceTimersByTime(waitMs: number): Promise<void> {
   const timeoutPromise: Promise<void> = new Promise(res => setTimeout(res, waitMs))
   jest.advanceTimersByTime(waitMs)