RequestTrace root = new RequestTrace("root", null, "root-data");
        RequestTrace level1 = new RequestTrace("level1", root, "level1-data");
        RequestTrace level2 = new RequestTrace("level2", level1, "level2-data");
        RequestTrace level3 = new RequestTrace(level2, "level3-data");

        // Verify the chain
        assertNull(root.parent());
        assertEquals(root, level1.parent());

      @Override
      long treeAggregate(@Nullable AvlNode<?> root) {
        return (root == null) ? 0 : root.totalCount;
      }
    },
    DISTINCT {
      @Override
      int nodeAggregate(AvlNode<?> node) {
        return 1;
      }

      @Override
      long treeAggregate(@Nullable AvlNode<?> root) {
        return (root == null) ? 0 : root.distinctElements;
      }
    };

    }

    /**
     * Verify that the message + rootCause constructor stores the root.
     */
    @Test
    @DisplayName("Message + root cause stores root cause")
    void testStringAndThrowableConstructor() {
        Throwable root = mock(Throwable.class);
        SmbException ex = new SmbException("oops", root);
        assertSame(root, ex.getRootCause());
    }

    /**

    }

    /**
     * Returns the set of robots.txt URLs.
     * @return The set of robots.txt URLs.
     */
    public Set<String> getRobotsTxtUrlSet() {
        return robotsTxtUrlSet;
    }

    /**
     * Sets the set of robots.txt URLs.
     * @param robotsTxtUrlSet The set of robots.txt URLs.
     */
    public void setRobotsTxtUrlSet(final Set<String> robotsTxtUrlSet) {

        Optional<BinaryNode> root = Optional.absent();
        for (int i = 0; i < size; i++) {
          root = Optional.of(new BinaryNode(rng.nextInt(), root, Optional.<BinaryNode>absent()));
        }
        return root;
      }
    },
    ALL_RIGHT {
      @Override
      Optional<BinaryNode> createTree(int size, Random rng) {
        Optional<BinaryNode> root = Optional.absent();

      "https://www.allizom.org/robots.txt",
      "https://tls13.crypto.mozilla.org/",
      "https://tls.ctf.network/robots.txt",
      "https://rustls.jbp.io/",
      "https://h2o.examp1e.net",
      "https://mew.org/",
      "https://tls13.baishancloud.com/",
      "https://tls13.akamai.io/",
      "https://swifttls.org/",
      "https://www.googleapis.com/robots.txt",
      "https://graph.facebook.com/robots.txt",

            throws SmbAuthException {
        return resolve(tf, domain, root, path, 5);
    }

    private DfsReferralData resolve(final CIFSContext tf, String domain, String root, final String path, final int depthLimit)
            throws SmbAuthException {

        if (tf.getConfig().isDfsDisabled() || root == null || root.equals("IPC$") || depthLimit <= 0) {

  @Deprecated
  public final FluentIterable<T> preOrderTraversal(T root) {
    checkNotNull(root);
    return new FluentIterable<T>() {
      @Override
      public UnmodifiableIterator<T> iterator() {
        return preOrderIterator(root);
      }
    };
  }

  UnmodifiableIterator<T> preOrderIterator(T root) {
    return new PreOrderIterator(root);
  }

        void testGetRootCause() {
            Exception rootCause = new IllegalStateException("Test root cause");
            TransportException exception = new TransportException("Message", rootCause);

            assertEquals(rootCause, exception.getRootCause());
        }

        @Test
        @DisplayName("Should return null when no root cause")
        void testGetRootCauseWhenNull() {

    /**
     * Returns an array of {@link Traverser} instances that handle collections of classes or resources based on the specified root package.
     *
     * @param rootPackage
     *            The root package.
     * @return An array of {@link Traverser} instances that handle collections of resources based on the specified root package.
     */
    public static Traverser[] getTraversers(final String rootPackage) {