@NotYetImplemented
    def "extension can be created on task"() {
        buildFile """
            interface MyExtension {
                Property<String> getProp()
            }

            tasks.register("mytask") {
                extensions.create("myext", MyExtension)
                myext.prop = "foobar"
                doLast {
                    println("myext.prop = " + myext.prop.get())

        model2.message == "It works from project :"

        and:
        fixture.assertStateLoaded()
        outputDoesNotContain("creating model")

        when:
        buildFile << """
            myExtension.message = 'this is the root project'
        """

        executer.withArguments(ENABLE_CLI)
        def model3 = fetchModel()

        then:
        model3.message == "this is the root project"

include::sample[dir="snippets/plugins/mappingExtensions/groovy",files="app/build.gradle[tags=snippet]"]
====

In this example, the `MyExtension` class defines an `inputParameter` property that can be set in the build script.
The `MyPlugin` class configures this extension and uses its `inputParameter` value to configure the `MyCustomTask` task.