)
        def detector = new CachingJvmMetadataDetector(metaDataDetector)
        File javaHome1 = Jvm.current().javaHome
        def link = new TestFile(Files.createTempDirectory(temporaryFolder.toPath(), null).toFile(), "jdklink")
        link.createLink(javaHome1)

        when:
        def metadata1 = detector.getMetadata(testLocation(link.absolutePath))
        link.createLink(new File("doesntExist"))

    }

    private void addLink(MutableModelNode modelNode, ModelRegistrations.Builder builder, boolean internal) {
        ModelRegistration registration = builder
            .descriptor(modelNode.getDescriptor())
            .hidden(internal)
            .build();
        modelNode.addLink(registration);
    }

        def extraOptions = target.isDirectory() ? ["/d"] : []
        assert ["cmd.exe", "/d", "/c", "mklink", *extraOptions, link, target].execute().waitFor() == 0
    }

    static void createWindowsJunction(File link, File target) {
        assert target.isDirectory(), "Windows junction only works on directory"
        assert ["cmd.exe", "/d", "/c", "mklink", "/j", link, target].execute().waitFor() == 0
    }

        def f = node("d")

        given:
        def listener = Mock(ModelListener) {
            matches(_) >> true
            getAncestor() >> a.path
        }
        a.addLink b
        b.addLink c

        when:
        graph.add(a)
        graph.add(b)
        graph.add(c)
        graph.addListener(listener)

        then:
        1 * listener.onDiscovered(b)

        Cast.uncheckedCast(ModelType.of(ChildNodeInitializerStrategy.class));

    public static <T> MutableModelNode addModelMapNode(MutableModelNode modelNode, ModelType<T> elementModelType, String name) {
        modelNode.addLink(
            ModelRegistrations.of(modelNode.getPath().child(name))
                .action(ModelActionRole.Create, NODE_INITIALIZER_REGISTRY_MODEL_REFERENCE, new BiAction<MutableModelNode, NodeInitializerRegistry>() {

            super(null, registration)
        }

        @Override
        Iterable<? extends ModelNodeInternal> getLinks() {
            return links
        }

        ModelNodeInternal addLink(ModelNodeInternal node) {
            links << node
            return node
        }

        @Override
        def <T> ModelView<? extends T> asMutable(ModelType<T> type, ModelRuleDescriptor ruleDescriptor) {

                                        }
                                    }))
                                    .build();
                                containerNode.addLink(itemRegistration);
                            }
                        }
                    });
                    container.whenObjectRemovedInternal(new Action<I>() {
                        @Override

     *
     * The path returned by {@link ModelRegistration#getPath()} is used to determine the name of the link.
     */
    void addLink(ModelRegistration registration);

    /**
     * Removes a node linked from this node from the graph.
     */
    void removeLink(String name);

    /**
     * Applies an action to this node.
     */

            .descriptor(descriptor)
            .action(ModelActionRole.Initialize, NoInputsModelAction.of(ModelReference.of(childPath, elementType), descriptor, action))
            .build();

        modelNode.addLink(registration);
    }

    @Override
    public void afterEach(Action<? super T> configAction) {
        state.assertCanMutate();

    }

    @Override
    public ModelAdapter getAdapter() {
        return target == null ? super.getAdapter() : target.getAdapter();
    }

    @Override
    public void addLink(ModelRegistration registration) {
        throw new UnsupportedOperationException();
    }

    @Override