break;
        case TIMED_WAITING:
          return;
        case TERMINATED:
          throw new AssertionError();
      }
    }
  }

  public void testDirectExecutorService_shutdownNow() {
    ExecutorService executor = newDirectExecutorService();
    assertEquals(ImmutableList.of(), executor.shutdownNow());
    assertTrue(executor.isShutdown());
  }