String s = testExecutor.invokeAny(tasks);
      assertEquals("ran0", s);
      mock.assertLastMethodCalled("invokeAny");
    }
    {
      MockExecutor mock = new MockExecutor();
      TimeUnit unit = SECONDS;
      long timeout = 5;
      TestExecutor testExecutor = new TestExecutor(mock);
      String s = testExecutor.invokeAny(tasks, timeout, unit);
      assertEquals(RESULT_VALUE + "0", s);

    }
  }

  /** invokeAny(null) throws NPE */
  public void testInvokeAnyImpl_nullTasks() throws Exception {
    ListeningExecutorService e = newDirectExecutorService();
    try {
      invokeAnyImpl(e, null, false, 0, NANOSECONDS);
      fail();
    } catch (NullPointerException success) {
    } finally {
      joinPool(e);
    }
  }

  /** invokeAny(empty collection) throws IAE */