file("src/main/java/SomeClass.java") << """
            @Helper class SomeClass {}
        """
        def processorProjectDir = file("processor")
        def fixture = new HelperProcessorFixture()
        fixture.writeApiTo(processorProjectDir)
        fixture.writeAnnotationProcessorTo(processorProjectDir)
        fixture.writeSupportLibraryTo(processorProjectDir)
    }

    @TargetGradleVersion(">=5.1")