def serviceFile = stream('org.gradle.ImplClass')

        when:
        def result = serviceLocator.findFactory(String.class).create()

        then:
        result instanceof String
        1 * classLoader.getResources("META-INF/services/java.lang.String") >> Collections.enumeration([serviceFile])
        1 * classLoader.loadClass('org.gradle.ImplClass') >> String
    }

    private
    fun jarWithInvalidPlugin(id: String, implClass: String): File =
        pluginJarWith(
            pluginDescriptorEntryFor(id, implClass),
            "$implClass.class" to publicClass(InternalName(implClass))
        )

    private
    fun jarForPlugin(id: String, implClass: String): File =
        pluginJarWith(
            pluginDescriptorEntryFor(id, implClass),

        String implClass = 'my.MyPlugin'
    ) {
        file("$targetBuildName/build.gradle") << """
            plugins {
                id("groovy-gradle-plugin")
            }
            gradlePlugin {
                plugins {
                    test {
                        id = "$pluginId"
                        implementationClass = "$implClass"
                    }
                }

        String name,
        Class<T> implClass,
        Action<BuildServiceSpec<P>> configuration = Actions.doNothing()
    ) {
        return registry.registerIfAbsent(name, implClass, configuration) as RegisteredBuildServiceProvider<T, P>
    }

    private buildFinished() {

            //
            // Add factory method
            //
            publicMethod("load", RETURN_OBJECT_FROM_STRING, methodVisitor -> new MethodVisitorScope(methodVisitor) {{
                // Call return new <implClass>(param1)
                _NEW(implementationType);
                _DUP();
                _ALOAD(1);
                _INVOKESPECIAL(implementationType, CONSTRUCTOR_NAME, RETURN_VOID_FROM_STRING);