WeakReference<Object> garbage = new WeakReference<>(new Object());
    GcFinalization.awaitClear(garbage);
    Lock writeLock = striped.get(key).writeLock();
    readLock.lock();
    assertFalse(writeLock.tryLock());
    readLock.unlock();
  }

  @AndroidIncompatible // Presumably GC doesn't trigger, despite our efforts.
  public void testStrongImplementations() {

      threadRecordFailure(t);
      throw t;
    }
  }

  /**
   * Just like assertFalse(b), but additionally recording (using threadRecordFailure) any
   * AssertionFailedError thrown, so that the current testcase will fail.
   */
  public void threadAssertFalse(boolean b) {
    try {
      assertFalse(b);
    } catch (AssertionFailedError t) {
      threadRecordFailure(t);
      throw t;
    }
  }

        builder.put(range1, 1).put(range2, 2);
        try {
          ImmutableRangeMap<Integer, Integer> unused = builder.build();
          assertFalse(expectRejection);
        } catch (IllegalArgumentException e) {
          assertTrue(expectRejection);
        }
      }
    }
  }

  public void testGet() {
    for (Range<Integer> range1 : RANGES) {

    /* Should recover to be able to remove() after next(). */
    assertEquals("B", peekingIterator.next());
    peekingIterator.remove();
    assertEquals("Should have removed an element", 2, list.size());
    assertFalse("Second element should be gone", list.contains("B"));
  }

  static class ThrowsAtEndException extends RuntimeException {
    /* nothing */
  }

  /**

        builder.put(range1, 1).put(range2, 2);
        try {
          ImmutableRangeMap<Integer, Integer> unused = builder.build();
          assertFalse(expectRejection);
        } catch (IllegalArgumentException e) {
          assertTrue(expectRejection);
        }
      }
    }
  }

  public void testGet() {
    for (Range<Integer> range1 : RANGES) {

  private static Test testsForSetUpTearDown() {
    AtomicBoolean setUpRan = new AtomicBoolean();
    Runnable setUp =
        new Runnable() {
          @Override
          public void run() {
            assertFalse("previous tearDown should have run before setUp", setUpRan.getAndSet(true));
          }
        };
    Runnable tearDown =
        new Runnable() {
          @Override
          public void run() {

    for (Range<Integer> range : RANGES) {
      RangeMap<Integer, Integer> rangeMap = TreeRangeMap.create();
      rangeMap.put(range, 1);

      try {
        assertEquals(range, rangeMap.span());
        assertFalse(range.isEmpty());
      } catch (NoSuchElementException e) {
        assertTrue(range.isEmpty());
      }
    }
  }

  public void testSpanTwoRanges() {
    for (Range<Integer> range1 : RANGES) {

    rangeSet.add(Range.closed(3, 10));
    assertEquals(Range.closed(3, 10), rangeSet.rangeContaining(5));
    assertTrue(rangeSet.contains(5));
    assertThat(rangeSet.rangeContaining(1)).isNull();
    assertFalse(rangeSet.contains(1));
  }

  public void testRangeContaining2() {
    RangeSet<Integer> rangeSet = TreeRangeSet.create();
    rangeSet.add(Range.closed(3, 10));
    rangeSet.remove(Range.open(5, 7));

   * extends AbstractListTester.) We could also iterate over all elements to
   * verify absence
   */
  protected void expectMissing(E... elements) {
    for (E element : elements) {
      assertFalse("Should not contain " + element, actualContents().contains(element));
    }
  }

  protected E[] createSamplesArray() {
    E[] array = getSubjectGenerator().createArray(getNumElements());

    /* Should recover to be able to remove() after next(). */
    assertEquals("B", peekingIterator.next());
    peekingIterator.remove();
    assertEquals("Should have removed an element", 2, list.size());
    assertFalse("Second element should be gone", list.contains("B"));
  }

  static class ThrowsAtEndException extends RuntimeException {
    /* nothing */
  }

  /**