test/com/android/i18n/addressinput/AsyncTestCase.java

/*
 * Copyright (C) 2010 Google Inc.
 *
 * 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.
 */

package com.android.i18n.addressinput;

import java.util.concurrent.TimeoutException;

import junit.framework.TestCase;

/**
 * An extension of TestCase that provides delayTestFinish() and finishTest() methods that behave
 * like the corresponding methods in GWTTestCase for testing asynchronous code.
 */
public abstract class AsyncTestCase extends TestCase {
  /**
   * Put the current test in asynchronous mode.
   *
   * @param timeoutMillis Wait this long before failing the test for time out.
   */
  protected void delayTestFinish(int timeoutMillis) {
    testTimeoutMillis = System.currentTimeMillis() + timeoutMillis;
  }

  /**
   * Cause this test to succeed during asynchronous mode.
   */
  protected void finishTest() {
    testIsFinished = true;
    synchronized (this) {
      notify();
    }
  }

  @Override
  protected void runTest() throws Throwable {
    testIsFinished = false;
    testTimeoutMillis = 0;
    super.runTest();

    if (testTimeoutMillis > 0) {
      long timeoutMillis = testTimeoutMillis - System.currentTimeMillis();
      if (timeoutMillis > 0) {
        synchronized (this) {
          wait(timeoutMillis);
        }
      }
      if (!testIsFinished) {
        throw new TimeoutException("Waited " + timeoutMillis + " ms!");
      }
    }
  }

  /**
   * Tracks whether this test is completely done.
   */
  private boolean testIsFinished;

  /**
   * The system time in milliseconds when the test should time out.
   */
  private long testTimeoutMillis;
}