f.setCreateTime(time);
                long newTime = f.createTime();
                if ( newTime == orig ) {
                    Assume.assumeTrue("Create time was not changed", false);
                }
                assertEquals(time, newTime);
            }
            catch ( SmbUnsupportedOperationException e ) {

  }

  /** Advance the simulated clock, then runs tasks that are ready. Used by the test thread only. */
  fun advanceUntil(newTime: Long) {
    taskRunner.assertLockNotHeld()

    taskRunner.withLock {
      check(currentTask == TestThreadSerialTask)
      nanoTime = newTime
      yieldUntil(ResumePriority.AfterOtherTasks)
    }
  }

  /** Confirm all tasks have completed. Used by the test thread only. */