classpath = classpath.plus(moduleRegistry.getExternalModule("groovy").getClasspath());
            classpath = classpath.plus(moduleRegistry.getExternalModule("groovy-json").getClasspath());
            classpath = classpath.plus(moduleRegistry.getExternalModule("groovy-xml").getClasspath());
            classpath = classpath.plus(moduleRegistry.getExternalModule("asm").getClasspath());

            moduleRegistry.getExternalModule("slf4j-api").getImplementationClasspath().getAsURLs(),
            moduleRegistry.getExternalModule("jul-to-slf4j").getImplementationClasspath().getAsURLs(),
            moduleRegistry.getExternalModule("native-platform").getImplementationClasspath().getAsURLs(),
            moduleRegistry.getExternalModule("kryo").getImplementationClasspath().getAsURLs(),

            "groovy-test",
            "groovy-xml",
            "javaparser-core");
        ClassPath groovy = moduleRegistry.getExternalModule("groovy").getClasspath();
        for (String groovyModule : groovyModules) {
            groovy = groovy.plus(moduleRegistry.getExternalModule(groovyModule).getClasspath());
        }
        return groovy;
    }

    private ClassPath gradleKotlinDsl() {

        module.implementationClasspath.asFiles == [classesDir, resourcesDir, staticResourcesDir]
        module.runtimeClasspath.asFiles == [externalRuntimeDep]

        def dep = registry.getExternalModule("dep")
        dep.implementationClasspath.asFiles == [externalRuntimeDep]
    }

    def "locates module using manifest from runtime ClassLoader when run from IDEA with a project imported by IDEA"() {
        given:

     *
     * @return the module. Does not return null.
     */
    Module getExternalModule(String name) throws UnknownModuleException;

    /**
     * Locates a module by name.
     *
     * @return the module. Does not return null.
     */

                // Jansi is required to log errors when generating Groovydoc
                ConfigurableFileCollection jansi = project.getObjects().fileCollection().from(moduleRegistry.getExternalModule("jansi").getImplementationClasspath().getAsFiles());
                return groovyClasspath.plus(jansi);
            });

            }
            for (String externalModule : RUNTIME_EXTERNAL_MODULES) {
                classpath = classpath.plus(moduleRegistry.getExternalModule(externalModule).getImplementationClasspath());
            }
            return classpath;
        }

        return null;
    }

    private static File jarFile(PersistentCache cache) {

    private static final int NUM_INTERNAL_JARS = 24
    private static final int NUM_EXTERNAL_JARS = 6

    ModuleRegistry moduleRegistry = Mock(ModuleRegistry) {
        getModule(_) >> { module(it[0], false) }
        getExternalModule(_) >> { module(it[0], true) }
    }

    def runtimeClasses = Spy(TestClassDetector)
    def classDetectorFactory = Mock(ForkedTestClasspathFactory.ClassDetectorFactory) {
        create(_, _) >> { runtimeClasses }

    @Override
    public ClassPath getAdditionalClassPath() {
        return gradleInstallation == null ? DefaultClassPath.of(classpath) : ClassPath.EMPTY;
    }

    @Override
    public Module getExternalModule(String name) {
        Module module = externalModules.get(name);
        if (module == null) {
            module = loadExternalModule(name);
            externalModules.put(name, module);
        }