public DefaultUnresolvedDependency(ModuleVersionSelector selector, Throwable problem) {
        this.selector = selector;
        this.problem = problem;
    }

    @Override
    public ModuleVersionSelector getSelector() {
        return selector;
    }

    @Override
    public Throwable getProblem() {
        return problem;
    }

    @Override
    public String toString() {

 * This information is able to be transformed into a `ModuleDependencyMetadata` instance.
 */
public abstract class ExternalDependencyDescriptor {

    public abstract ModuleComponentSelector getSelector();

    public abstract boolean isOptional();

    public abstract boolean isConstraint();

    public abstract boolean isChanging();

    public abstract boolean isTransitive();

 */
public interface DependencyGraphEdge extends ResolvedGraphDependency {
    DependencyGraphNode getFrom();

    DependencyGraphSelector getSelector();

    boolean isTransitive();

    ExcludeSpec getExclusions();

    boolean contributesArtifacts();

    DependencyMetadata getDependencyMetadata();

    ImmutableAttributes getAttributes();

    def "returns a module component selector if descriptor indicates a default dependency"() {
        given:
        def metadata = create(requested)

        when:
        ComponentSelector componentSelector = metadata.getSelector()

        then:
        componentSelector instanceof ModuleComponentSelector
        componentSelector.group == 'org'
        componentSelector.module == 'module'
        componentSelector.version == '1.2+'
    }

        }

        @Override
        public void listModuleVersions(ModuleDependencyMetadata dependency, BuildableModuleVersionListingResolveResult result) {
            ModuleIdentifier identifier = dependency.getSelector().getModuleIdentifier();
            whenModulePresent(identifier, null,
                    () -> delegate.listModuleVersions(dependency, result),
                    () -> result.listed(Collections.emptyList()));
        }

	ctx.ForEach(gvk.Gateway, func(r *resource.Instance) bool {
		gw := r.Message.(*v1alpha3.Gateway)
		gwName := r.Metadata.FullName.String()

		gwSelector := klabels.SelectorFromSet(gw.GetSelector())
		sGWSelector := gwSelector.String()
		for _, server := range gw.GetServers() {
			sPortNumber := strconv.Itoa(int(server.GetPort().GetNumber()))
			mapKey := genGatewayMapKey(sGWSelector, sPortNumber)

    }

    @Override
    public String toString() {
        return "dependency: " + selector + " to-conf: " + dependencyConfiguration;
    }

    @Override
    public ComponentSelector getSelector() {
        return selector;
    }

    @Override
    public GraphVariantSelectionResult selectVariants(
        GraphVariantSelector variantSelector,
        ImmutableAttributes consumerAttributes,

                getArtifacts() >> []
            }
            getExclusions() >> Mock(ExcludeSpec)
            getAttributes() >> ImmutableAttributes.EMPTY
            getSelector() >> Mock(DependencyGraphSelector) {
                getRequested() >> Mock(ComponentSelector) {
                    getRequestedCapabilities() >> []
                }
            }
        }

	return m.targetRef
}

func (m *mockPolicyTargetGetter) GetTargetRefs() []*v1beta1.PolicyTargetReference {
	return m.targetRefs
}

func (m *mockPolicyTargetGetter) GetSelector() *v1beta1.WorkloadSelector {
	return m.selector
}

var mockKind = config.GroupVersionKind{
	Group:   "mock.istio.io",
	Version: "v1",
	Kind:    "MockKind",

        }
        return new DefaultProjectDependencyMetadata((ProjectComponentSelector) target, this);
    }

    @Override
    public ModuleComponentSelector getSelector() {
        return selector;
    }

    @Override
    public List<ExcludeMetadata> getExcludes() {
        return excludes;
    }

    @Override