Convert LooperExecutorTest in AppRTC Demo into JUnit test

webrtc/examples/androidtests/src/org/appspot/apprtc/test/LooperExecutorTest.java

-/*
- *  Copyright 2015 The WebRTC Project Authors. All rights reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-package org.appspot.apprtc.test;
-
-import java.util.concurrent.CountDownLatch;
-import java.util.concurrent.TimeUnit;
-
-import org.appspot.apprtc.util.LooperExecutor;
-
-import android.test.InstrumentationTestCase;
-import android.test.suitebuilder.annotation.SmallTest;
-import android.util.Log;
-
-public class LooperExecutorTest extends InstrumentationTestCase {
-  private static final String TAG = "LooperTest";
-  private static final int WAIT_TIMEOUT = 5000;
-
-  @SmallTest
-  public void testLooperExecutor() throws InterruptedException {
-    Log.d(TAG, "testLooperExecutor");
-    final int counter[] = new int[1];
-    final int expectedCounter = 10;
-    final CountDownLatch looperDone = new CountDownLatch(1);
-
-    Runnable counterIncRunnable = new Runnable() {
-      @Override
-      public void run() {
-        counter[0]++;
-        Log.d(TAG, "Run " + counter[0]);
-      }
-    };
-    LooperExecutor executor = new LooperExecutor();
-
-    // Try to execute a counter increment task before starting an executor.
-    executor.execute(counterIncRunnable);
-
-    // Start the executor and run expected amount of counter increment task.
-    executor.requestStart();
-    for (int i = 0; i < expectedCounter; i++) {
-      executor.execute(counterIncRunnable);
-    }
-    executor.execute(new Runnable() {
-      @Override
-      public void run() {
-        looperDone.countDown();
-      }
-    });
-    executor.requestStop();
-
-    // Try to execute a task after stopping the executor.
-    executor.execute(counterIncRunnable);
-
-    // Wait for final looper task and make sure the counter increment task
-    // is executed expected amount of times.
-    looperDone.await(WAIT_TIMEOUT, TimeUnit.MILLISECONDS);
-    assertTrue (looperDone.getCount() == 0);
-    assertTrue (counter[0] == expectedCounter);
-
-    Log.d(TAG, "testLooperExecutor done");
-  }
-}