.build()
            .newThread(monitoredRunnable)
            .getUncaughtExceptionHandler());
  }

  public void testBuildMutateBuild() {
    ThreadFactory factory1 = builder.setPriority(1).build();
    assertEquals(1, factory1.newThread(monitoredRunnable).getPriority());

    ThreadFactory factory2 = builder.setPriority(2).build();
    assertEquals(1, factory1.newThread(monitoredRunnable).getPriority());

            .build()
            .newThread(monitoredRunnable)
            .getUncaughtExceptionHandler());
  }

  public void testBuildMutateBuild() {
    ThreadFactory factory1 = builder.setPriority(1).build();
    assertEquals(1, factory1.newThread(monitoredRunnable).getPriority());

    ThreadFactory factory2 = builder.setPriority(2).build();
    assertEquals(1, factory1.newThread(monitoredRunnable).getPriority());

        new ThreadPoolExecutor(1, 2, 3, SECONDS, new ArrayBlockingQueue<Runnable>(1));
    assertThat(application.getExitingExecutorService(executor)).isNotNull();
    assertTrue(executor.getThreadFactory().newThread(() -> {}).isDaemon());
  }

  @AndroidIncompatible // Mocking ExecutorService is forbidden there. TODO(b/218700094): Don't mock.
  public void testGetExitingExecutorService_executorDelegatesToOriginal() {

        new ThreadPoolExecutor(1, 2, 3, SECONDS, new ArrayBlockingQueue<Runnable>(1));
    assertThat(application.getExitingExecutorService(executor)).isNotNull();
    assertTrue(executor.getThreadFactory().newThread(() -> {}).isDaemon());
  }

  @AndroidIncompatible // Mocking ExecutorService is forbidden there. TODO(b/218700094): Don't mock.
  public void testGetExitingExecutorService_executorDelegatesToOriginal() {

      }
    }
  }

  /** For use as ThreadFactory in constructors */
  public static class SimpleThreadFactory implements ThreadFactory {
    @Override
    public Thread newThread(Runnable r) {
      return new Thread(r);
    }
  }

  public interface TrackedRunnable extends Runnable {
    boolean isDone();
  }