}

		// Check children.
		gotChildren := make(map[trace.TaskID]struct{})
		for _, child := range summary.Children {
			gotChildren[child.ID] = struct{}{}
		}
		for _, wantChild := range want.children {
			if _, ok := gotChildren[wantChild]; ok {
				delete(gotChildren, wantChild)
			} else {
				t.Errorf("expected child task %d for task %d not found", wantChild, id)

          return getChildren(node);
        }
      }.preOrderTraversal(root);
    }

    @AfterTemplate
    Iterable<N> after(N root) {
      return Traverser.forTree((N node) -> getChildren(node)).depthFirstPreOrder(root);
    }
  }

  abstract class TreeTraverserPostOrder<N> {
    @Placeholder
    abstract Iterable<N> getChildren(N node);

    @BeforeTemplate

        for (Node library : getChildren(libraryTable, "library")) {
            ProjectLibrary projectLibrary = new ProjectLibrary();
            projectLibrary.setName((String) library.attribute("name"));
            projectLibrary.setClasses(collectRootUrlAsFiles(getChildren(library, "CLASSES")));
            projectLibrary.setJavadoc(collectRootUrlAsFiles(getChildren(library, "JAVADOC")));

                Set<String> names =
                        recessive.getChildren().stream().map(XmlNode::getName).collect(Collectors.toSet());
                for (String name : names) {
                    List<XmlNode> dominantChildren = dominant.getChildren().stream()
                            .filter(n -> n.getName().equals(name))
                            .collect(Collectors.toList());

    public boolean hasHiddenNonBuildable() {
        return showDependentPredicate.hiddenNonBuildable;
    }

    private Set<? extends RenderableDependency> getChildren(RenderableDependency node) {
        return Sets.filter(node.getChildren(), showDependentPredicate);
    }

    private static class DependentBinaryNodeRenderer implements NodeRenderer {

        private boolean seenTestSuite;

        @Override

        assertEquals(2, result.getChildren("topsub1").length);
        assertEquals("t2s1Value", result.getChildren("topsub1")[0].getValue());
        assertEquals("t1s1Value", result.getChildren("topsub1")[1].getValue());

        assertEquals("t1top", result.getInputLocation());
        assertEquals("t2s1", result.getChildren("topsub1")[0].getInputLocation());

    }

    private void readReferencedProjects() {
        for (Node projectNode : getChildren(findFirstChildNamed(getXml(), "projects"), "project")) {
            referencedProjects.add(projectNode.text());
        }
    }

    private void readNatures() {
        for (Node natureNode : getChildren(findFirstChildNamed(getXml(), "natures"), "nature")) {
            natures.add(natureNode.text());
        }

                for (Node library : getChildren(orderEntry, "library")) {
                    for (Node classesNode : getChildren(library, "CLASSES")) {
                        readDependenciesPathsFromXml(classes, classesNode);
                    }
                    for (Node javadocNode : getChildren(library, "JAVADOC")) {
                        readDependenciesPathsFromXml(javadoc, javadocNode);

        for (ClassNode child : classNode.getChildren()) {
            writeLibraryAccessorClass(child, deprecated);
            writeLibrarySubClasses(child, deprecated);
        }
    }

    private void writeVersionSubClasses(ClassNode classNode) throws IOException {
        for (ClassNode child : classNode.getChildren()) {
            writeVersionAccessorClass(child);

    }

    protected static List<Node> getChildren(@Nullable Node root, String name) {
        return root == null ? Collections.<Node>emptyList() : Cast.<List<Node>>uncheckedCast(root.get(name));
    }

    @Nullable
    public static Node findFirstChildNamed(@Nullable Node root, String name) {
        return root == null ? null : Iterables.getFirst(getChildren(root, name), null);
    }

    @Nullable