Test that allows extending a built-in Wrapper task by a non abstract user-defined class

MyWrapperIntegrationTest.java

class TmpIntegrationTest extends AbstractIntegrationSpec {

    def "tmp test"() {
        settingsFile << """
            rootProject.name = "root"
        """
        buildFile << """
            class MyWrapper extends Wrapper {

                // Just to make MyWrapper compile
                @Override
                public Property<Boolean> getValidateDistributionUrl() { return getServices().get(ObjectFactory.class).property(Boolean.class).convention(true); }
            }

            tasks.register("myWrapper", MyWrapper)
        """

        expect:
        file("gradle/wrapper/gradle-wrapper.properties").assertDoesNotExist()

        when:
        run("myWrapper")

        then:
        file("gradle/wrapper/gradle-wrapper.properties").exists()
    }

}