public K firstKey() {
    Entry<K, V> entry = firstEntry();
    if (entry == null) {
      throw new NoSuchElementException();
    } else {
      return entry.getKey();
    }
  }

  @Override
  @ParametricNullness
  public K lastKey() {
    Entry<K, V> entry = lastEntry();
    if (entry == null) {
      throw new NoSuchElementException();
    } else {
      return entry.getKey();
    }
  }

  @Override

        final OpenSearchUrlQueue urlQueue = new OpenSearchUrlQueue();
        urlQueue.setCreateTime(System.currentTimeMillis());
        urlQueue.setDepth(1);
        urlQueue.setMethod("GET");
        urlQueue.setSessionId("id1");
        urlQueue.setUrl("http://www.id1.com/");

        urlQueueService.insert(urlQueue);

        final OpenSearchUrlQueue urlQueue2 = new OpenSearchUrlQueue();

  }

  @MapFeature.Require({SUPPORTS_PUT, SUPPORTS_REMOVE})
  public void testReplaceValuesWithEmpty() {
    int size = multimap().size();
    List<V> oldValues = new ArrayList<>(multimap().get(k0()));
    List<V> values = emptyList();
    assertEquals(oldValues, new ArrayList<V>(multimap().replaceValues(k0(), values)));
    assertGet(k0());
    assertEquals(size - oldValues.size(), multimap().size());
  }

        return caught;
      }
      throw new AssertionError(
          "expected to throw " + expectedThrowable.getSimpleName() + " but threw " + t, t);
    }
    if (userPassedSupplier) {
      throw new AssertionError(
          "expected to throw "
              + expectedThrowable.getSimpleName()
              + " but returned result: "
              + result);
    } else {

        return caught;
      }
      throw new AssertionError(
          "expected to throw " + expectedThrowable.getSimpleName() + " but threw " + t, t);
    }
    if (userPassedSupplier) {
      throw new AssertionError(
          "expected to throw "
              + expectedThrowable.getSimpleName()
              + " but returned result: "
              + result);
    } else {

            if (proxy != null) {
                org.apache.maven.repository.Proxy p = new org.apache.maven.repository.Proxy();
                p.setHost(proxy.getHost());
                p.setProtocol(proxy.getType());
                p.setPort(proxy.getPort());
                if (proxy.getAuthentication() != null) {
                    repo = new RemoteRepository.Builder(repo).setProxy(proxy).build();

    @Nullable
    Predicate<PathType> getPathTypeFilter();

    @Nullable
    List<RemoteRepository> getRepositories();

    @Nonnull
    static DependencyResolverRequestBuilder builder() {
        return new DependencyResolverRequestBuilder();
    }

    @Nonnull
    static DependencyResolverRequest build(Session session, RequestType requestType, Artifact rootArtifact) {

        final ObjectMapper mapper = new ObjectMapper();
        final AtomicBoolean resetJobs = new AtomicBoolean(false);
        try (CurlResponse response = ComponentUtil.getCurlHelper().post("/_bulk").onConnect((req, con) -> {
            con.setDoOutput(true);
            try (final BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(tempFile)));

     */
    @Test
    public void testIsAncestor() throws Exception {
        final ClassLoader cl1 = new URLClassLoader(new URL[] { new URL("file:/foo") }, null);
        final ClassLoader cl2 = new URLClassLoader(new URL[] { new URL("file:/bar") }, cl1);
        final ClassLoader cl3 = new URLClassLoader(new URL[] { new URL("file:/baz") }, cl2);

        assertThat(ClassLoaderUtil.isAncestor(cl3, cl2), is(true));

  private static final ImmutableRangeSet<Comparable<?>> EMPTY =
      new ImmutableRangeSet<>(ImmutableList.<Range<Comparable<?>>>of());

  private static final ImmutableRangeSet<Comparable<?>> ALL =
      new ImmutableRangeSet<>(ImmutableList.of(Range.<Comparable<?>>all()));

  /**
   * Returns a {@code Collector} that accumulates the input elements into a new {@code