Thread.sleep(millis);
      } catch (InterruptedException wontHappen) {
        throw new AssertionError();
      }
      completed = true;
    }
  }

  public void testMakeUninterruptible_untimed_uninterrupted() throws Exception {
    runUntimedInterruptsTest(0);
  }

  public void testMakeUninterruptible_untimed_interrupted() throws Exception {
    runUntimedInterruptsTest(1);
  }