assertEquals(expectedIsOccupied, monitor.isOccupied());
    assertEquals(expectedIsOccupiedByCurrentThread, monitor.isOccupiedByCurrentThread());
    assertEquals(expectedOccupiedDepth, monitor.getOccupiedDepth());
  }

  private static void verifyOccupiedMethodsInAnotherThread(
      Monitor monitor,
      boolean expectedIsOccupied,
      boolean expectedIsOccupiedByCurrentThread,

    assertEquals(expectedIsOccupied, monitor.isOccupied());
    assertEquals(expectedIsOccupiedByCurrentThread, monitor.isOccupiedByCurrentThread());
    assertEquals(expectedOccupiedDepth, monitor.getOccupiedDepth());
  }

  private static void verifyOccupiedMethodsInAnotherThread(
      Monitor monitor,
      boolean expectedIsOccupied,
      boolean expectedIsOccupiedByCurrentThread,

    thread1.callAndAssertReturns(enterCount != 0, "isOccupiedByCurrentThread");
    thread1.callAndAssertReturns(enterCount, "getOccupiedDepth");

    thread2.callAndAssertReturns(enterCount != 0, "isOccupied");
    thread2.callAndAssertReturns(false, "isOccupiedByCurrentThread");
    thread2.callAndAssertReturns(0, "getOccupiedDepth");
  }

  public final void testEnterWhen_initiallyTrue() throws Exception {

  /**
   * Returns the number of times the current thread has entered this monitor in excess of the number
   * of times it has left. Returns 0 if the current thread is not occupying this monitor.
   */
  public int getOccupiedDepth() {
    return lock.getHoldCount();
  }

  /**
   * Returns an estimate of the number of threads waiting to enter this monitor. The value is only