}

    @Test
    void testGetException() {
        DefaultProblem problem = new DefaultProblem(null, null, null, -1, -1, null);
        assertNull(problem.getException());

        Exception e = new Exception();
        problem = new DefaultProblem(null, null, null, -1, -1, e);
        assertSame(e, problem.getException());
    }

    @Test
    void testGetSource() {

            )
        .inOrder();
  }

  public void testLegacyAsyncDispatcher() {
    dispatcher = Dispatcher.legacyAsync();

    final CyclicBarrier barrier = new CyclicBarrier(2);
    final CountDownLatch latch = new CountDownLatch(2);

    new Thread(
            new Runnable() {
              @Override
              public void run() {
                try {
                  barrier.await();

    @Override
    public void log(final LogType key, final Object... objs) {
        if (!ComponentUtil.available()) {
            if (logger.isDebugEnabled()) {
                logger.debug("container was destroyed.");
            }
            return;
        }
        super.log(key, objs);
    }

    @Override
    protected void processStartCrawling(final Object... objs) {

  }

  @Test
  public void equivalent_nodeSetsDiffer() {
    network.addNode(N1);

    MutableNetwork<Integer, String> g2 = createNetwork(edgeType);
    g2.addNode(N2);

    assertThat(network).isNotEqualTo(g2);
  }

  // Node sets are the same, but edge sets differ.
  @Test
  public void equivalent_edgeSetsDiffer() {
    network.addEdge(N1, N2, E12);

  }

  @Test
  public void equivalent_nodeSetsDiffer() {
    network.addNode(N1);

    MutableNetwork<Integer, String> g2 = createNetwork(edgeType);
    g2.addNode(N2);

    assertThat(network).isNotEqualTo(g2);
  }

  // Node sets are the same, but edge sets differ.
  @Test
  public void equivalent_edgeSetsDiffer() {
    network.addEdge(N1, N2, E12);

    return false;
  }

  public void testClear() {
    table = create("foo", 1, 'a', "bar", 1, 'b', "foo", 3, 'c');
    if (supportsRemove()) {
      table.clear();
      assertEquals(0, table.size());
      assertFalse(table.containsRow("foo"));
    } else {
      assertThrows(UnsupportedOperationException.class, () -> table.clear());
    }
  }

  public void testPut() {

        // not used
        return null;
    }

    public void addFeature(final String key, final String value) {
        if (StringUtil.isBlank(key) || StringUtil.isBlank(value)) {
            throw new CrawlerSystemException("key or value is null.");
        }

        featureMap.put(key, value);
    }

    public void addProperty(final String key, final String value) {

  private byte[] data;

  @Override
  protected void setUp() throws Exception {
    super.setUp();

    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    DataOutputStream out = new DataOutputStream(baos);

    initializeData(out);

    data = baos.toByteArray();
  }

  private void initializeData(DataOutputStream out) throws IOException {

  private byte[] data;

  @Override
  protected void setUp() throws Exception {
    super.setUp();

    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    DataOutputStream out = new DataOutputStream(baos);

    initializeData(out);

    data = baos.toByteArray();
  }

  private void initializeData(DataOutputStream out) throws IOException {

    return suite;
  }

  public void testCreate() {
    TreeMultiset<String> multiset = TreeMultiset.create();
    multiset.add("foo", 2);
    multiset.add("bar");
    assertEquals(3, multiset.size());
    assertEquals(2, multiset.count("foo"));
    assertEquals(Ordering.natural(), multiset.comparator());
    assertEquals("[bar, foo x 2]", multiset.toString());
  }

  public void testCreateWithComparator() {