thread1.callAndAssertReturns(true, tryEnter());
    thread2.callAndAssertReturns(false, tryEnter());
    thread1.callAndAssertReturns(true, tryEnter());
    thread2.callAndAssertReturns(false, tryEnter());
    thread1.callAndAssertReturns(leave());
    thread2.callAndAssertReturns(false, tryEnter());
    thread1.callAndAssertReturns(leave());
    thread2.callAndAssertReturns(true, tryEnter());
  }

    return method.getName().startsWith("enter") || method.getName().startsWith("tryEnter");
  }

  /** Identifies just tryEnterXxx methods (a subset of {@link #isAnyEnter}), which never block. */
  private static boolean isTryEnter(Method method) {
    return method.getName().startsWith("tryEnter");
  }

  /**

 * as the condition of an <i>if</i> statement containing a <i>try/finally</i> block to ensure that
 * the current thread leaves the monitor cleanly:
 *
 * {@snippet :
 * if (monitor.tryEnter()) {
 *   try {
 *     // do things while occupying the monitor
 *   } finally {
 *     monitor.leave();
 *   }
 * } else {
 *   // do other things since the monitor was not available
 * }
 * }
 *