thread.waitUntilHoldingLock();
    assertFalse(lockA.tryLock());

    thread.releaseLockAndFinish();
    assertTrue(lockA.tryLock());
  }

  public void testReentrantWriteLock_tryLock() throws Exception {
    LockingThread thread = new LockingThread(writeLockA);
    thread.start();

    thread.waitUntilHoldingLock();
    assertFalse(writeLockA.tryLock());
    assertFalse(readLockA.tryLock());

    thread.waitUntilHoldingLock();
    assertFalse(lockA.tryLock());

    thread.releaseLockAndFinish();
    assertTrue(lockA.tryLock());
  }

  public void testReentrantWriteLock_tryLock() throws Exception {
    LockingThread thread = new LockingThread(writeLockA);
    thread.start();

    thread.waitUntilHoldingLock();
    assertFalse(writeLockA.tryLock());
    assertFalse(readLockA.tryLock());

      Set<V> expectedValues = copyToSet(values);

      assertFalse(multimap().put(k, v));
      assertEquals(expectedValues, values);
      assertGet(k, expectedValues);
    }
  }

  @MapFeature.Require({SUPPORTS_PUT, ALLOWS_NULL_VALUES})
  @CollectionSize.Require(absent = ZERO)
  public void testPutDuplicateValue_null() {
    initMultimapWithNullValue();
    assertFalse(multimap().put(getKeyForNullValue(), null));

    assertTrue(permutationSet.contains(newArrayList(2, 3, 1)));
    assertFalse(permutationSet.contains(newArrayList(1, 2)));
    assertFalse(permutationSet.contains(newArrayList(1, 1, 2, 3)));
    assertFalse(permutationSet.contains(newArrayList(1, 2, 3, 4)));
    assertFalse(permutationSet.contains(null));
  }

  public void testPermutationSetEmpty() {

public class MultisetElementSetTester<E> extends AbstractMultisetTester<E> {
  @CollectionFeature.Require(SUPPORTS_ADD)
  public void testElementSetReflectsAddAbsent() {
    Set<E> elementSet = getMultiset().elementSet();
    assertFalse(elementSet.contains(e3()));
    getMultiset().add(e3(), 4);
    assertTrue(elementSet.contains(e3()));
  }

  @CollectionSize.Require(absent = ZERO)
  @CollectionFeature.Require(SUPPORTS_REMOVE)

    ByteSource fewerBytes = new TestByteSource(newPreFilledByteArray(bytes.length / 2));
    assertFalse(source.contentEquals(fewerBytes));

    byte[] copy = bytes.clone();
    copy[9876] = 1;
    ByteSource oneByteOff = new TestByteSource(copy);
    assertFalse(source.contentEquals(oneByteOff));
  }

  public void testSlice() throws IOException {
    // Test preconditions

    assertFalse(listener.healthyCalled);
    assertState(manager, Service.State.RUNNING, a, c, e);
    assertEquals(ImmutableSet.of(b, d), listener.failedServices);
    assertState(manager, Service.State.FAILED, b, d);
    assertFalse(manager.isHealthy());

    manager.stopAsync().awaitStopped();
    assertFalse(manager.isHealthy());
    assertFalse(listener.healthyCalled);

  }

  public void testIsInStrictOrder() {
    assertFalse(isInStrictOrder(asList(5, 3, 0, 9), Ordering.natural()));
    assertFalse(isInStrictOrder(asList(0, 5, 3, 9), Ordering.natural()));
    assertTrue(isInStrictOrder(asList(0, 3, 5, 9), Ordering.natural()));
    assertFalse(isInStrictOrder(asList(0, 0, 3, 3), Ordering.natural()));

      String value = key.toString();
      assertSame(value, cache.getUnchecked(key));
      assertFalse(cache.asMap().isEmpty());
      cache.invalidateAll();
      assertEquals(0, cache.size());
      assertTrue(cache.asMap().isEmpty());
      assertFalse(cache.asMap().containsKey(key));
      assertFalse(cache.asMap().containsValue(value));
    }
  }

  public void testKeySetEntrySetValues() {

  }

  public void testAccept() {
    File dir = new File("foo");
    FilenameFilter filter = new PatternFilenameFilter("a+");
    assertTrue(filter.accept(dir, "a"));
    assertTrue(filter.accept(dir, "aaaa"));
    assertFalse(filter.accept(dir, "b"));

    // Show that dir is ignored
    assertTrue(filter.accept(null, "a"));
  }

  public void testNulls() throws Exception {
    NullPointerTester tester = new NullPointerTester();