*
 * <p>If you have your own graph implementation based around a custom node type {@code MyNode},
 * which has a method {@code getChildren()} that retrieves its successors in a graph:
 *
 * {@snippet :
 * someGraphAlgorithm(startNode, MyNode::getChildren);
 * }
 *
 * <p>If you have some other mechanism for returning the successors of a node, or one that doesn't

        Set<Artifact> artifacts = new LinkedHashSet<>();
        if (result.getDependencyGraph() != null
                && !result.getDependencyGraph().getChildren().isEmpty()) {
            RepositoryUtils.toArtifacts(
                    artifacts,
                    result.getDependencyGraph().getChildren(),
                    Collections.singletonList(project.getArtifact().getId()),
                    collectionFilter);
        }

    entry.updateChild("file1.txt", attrs);
    
    assertTrue(entry.hasChild("file1.txt"));
    assertEquals(1, entry.getChildren().size());
    
    // Test removal
    entry.removeChild("file1.txt");
    assertFalse(entry.hasChild("file1.txt"));
    assertEquals(0, entry.getChildren().size());
}

@Test
public void testDirectoryLeaseManager() {

        if (fromProject != null) {
            MavenProject toProject = projectMap.get(toVertex.getLabel());
            fromProject.addProjectReference(toProject);
        }

        if (force && toVertex.getChildren().contains(fromVertex)) {
            graph.removeEdge(toVertex, fromVertex);
        }

        try {
            graph.addEdge(fromVertex, toVertex);
        } catch (CycleDetectedException e) {

        Vertex(String label) {
            this.label = label;
        }

        String getLabel() {
            return label;
        }

        List<Vertex> getChildren() {
            return children;
        }

        List<Vertex> getParents() {
            return parents;
        }
    }

            addEdge(parentVertex, vertex, e);
        } else {
            entry = vertex;
        }

        MetadataTreeNode[] kids = node.getChildren();
        if (kids == null || kids.length < 1) {
            return;
        }

        for (int i = 0; i < kids.length; i++) {
            MetadataTreeNode n = kids[i];

        Vertex(String label) {
            this.label = label;
        }

        String getLabel() {
            return label;
        }

        List<Vertex> getChildren() {
            return children;
        }

        List<Vertex> getParents() {
            return parents;
        }
    }

    static class CycleDetectedException extends RuntimeException {

        }

        depRequest.setRoot(node);

        if (logger.isWarnEnabled()) {
            for (DependencyNode child : node.getChildren()) {
                if (!child.getRelocations().isEmpty()) {
                    org.eclipse.aether.artifact.Artifact artifact =
                            child.getDependency().getArtifact();

        assertEquals("BOOM1: BOOM2: BOOM3: [CIRCULAR REFERENCE]", summary.getMessage());
        assertEquals("", summary.getReference());
        assertEquals(0, summary.getChildren().size());
        assertEquals(boom1, summary.getException());
    }

    /**
     * Gets the children of this result.
     *
     * @return the children of this result, can be empty but never {@code null}
     */
    @Nonnull
    List<? extends ModelBuilderResult> getChildren();

    /**
     * Creates a human-readable representation of these errors.
     */
    @Override
    String toString();