when:
        buildFile << testablePluginProject()

        file('src/test/groovy/MyTest.groovy') << """
            class MyTest extends groovy.test.GroovyTestCase {

                void testImplIsHidden() {
                    try {
                        getClass().classLoader.loadClass("$Maps.name")
                        assert false : "expected $Maps.name not to be visible"