.add("in", "the", "quick", "jumped", "over", "a")
            .build();
    assertTrue(set.contains("quick"));
    assertTrue(set.contains("google"));
    assertFalse(set.contains(""));
    assertFalse(set.contains("california"));
    assertFalse(set.contains(null));
  }

  @SuppressWarnings("CollectionIncompatibleType") // testing incompatible types

      return size() - index;
    }

    @Override
    public ImmutableList<E> reverse() {
      return forwardList;
    }

    @Override
    public boolean contains(@Nullable Object object) {
      return forwardList.contains(object);
    }

    @Override
    public int indexOf(@Nullable Object object) {
      int index = forwardList.lastIndexOf(object);

        assertNotNull(first);
        assertNotNull(second);
        // Due to round-robin, should get different channels or same order
        assertTrue(Arrays.asList(channel1, channel2).contains(first));
        assertTrue(Arrays.asList(channel1, channel2).contains(second));
    }

    @Test
    void testLeastLoadedStrategy() {
        loadBalancer.setStrategy(LoadBalancingStrategy.LEAST_LOADED);

        data.setWeight(1.5f);

        String result = data.toString();
        assertNotNull(result);
        assertTrue(result.contains("RequestData"));
        assertTrue(result.contains("GET"));
        assertTrue(result.contains("https://example.com"));
        assertTrue(result.contains("1.5"));
    }

    public void test_toStringWithNullValues() {
        // Test toString with null values

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE components PUBLIC "-//DBFLUTE//DTD LastaDi 1.0//EN"
	"http://dbflute.org/meta/lastadi10.dtd">
<components namespace="fessCrawler">
	<include path="crawler/container.xml" />
	<include path="crawler/transformer.xml" />

	<component name="ruleManager"
		class="org.codelibs.fess.crawler.rule.impl.RuleManagerImpl" instance="prototype">
		<postConstruct name="addRule">
			<arg>sitemapsRule</arg>
		</postConstruct>

        assertNotNull(result);
        assertTrue(result.startsWith("ServerInfo1["));
        assertTrue(result.contains("name=SERVER01"));
        assertTrue(result.contains("versionMajor=6"));
        assertTrue(result.contains("versionMinor=1"));
        assertTrue(result.contains("type=0x00000801"));
        assertTrue(result.contains("commentOrMasterBrowser=Test server"));
        assertTrue(result.endsWith("]"));
    }

    @Test

  }

  @Override
  public int count(@Nullable Object element) {
    try {
      @SuppressWarnings("unchecked")
      E e = (E) element;
      AvlNode<E> root = rootReference.get();
      if (!range.contains(e) || root == null) {
        return 0;
      }
      return root.count(comparator(), e);
    } catch (ClassCastException | NullPointerException e) {
      return 0;
    }
  }

    @ParametricNullness
    public E set(int index, @ParametricNullness E element) {
      return backingList.set(index, element);
    }

    @Override
    public boolean contains(@Nullable Object o) {
      return backingList.contains(o);
    }

    @Override
    public int size() {
      return backingList.size();
    }
  }

        } catch (CurlException e) {
            assertTrue(e.getMessage().contains("Failed to access the content"));
            // The cause should be another CurlException from getContentAsStream()
            assertTrue(e.getCause() instanceof CurlException);
            CurlException innerException = (CurlException) e.getCause();
            assertTrue(innerException.getMessage().contains("The content does not exist"));

   */
  int outDegree(N node);

  /**
   * Returns true if there is an edge that directly connects {@code nodeU} to {@code nodeV}. This is
   * equivalent to {@code nodes().contains(nodeU) && successors(nodeU).contains(nodeV)}.
   *
   * <p>In an undirected graph, this is equal to {@code hasEdgeConnecting(nodeV, nodeU)}.
   *
   * @since 23.0
   */
  boolean hasEdgeConnecting(N nodeU, N nodeV);

  /**