}

    def "plugin can create instance of interface with mutable properties"() {
        buildFile """
            interface Thing {
                String getProp()
                void setProp(String value)
            }

            def t = objects.newInstance(Thing)
            assert t.prop == null
            t.prop = "value"
            assert t.prop == "value"
"""

        expect:

        listenerManager.getBroadcaster(BuildListener).buildFinished(Stub(BuildResult))
    }

    interface Params extends BuildServiceParameters {
        String getProp()

        void setProp(String value)
    }

    static abstract class ServiceImpl implements BuildService<Params> {
        static List<ServiceImpl> instances = []

        String getProp() {
            return getParameters().prop