private GradleRunner run(String... args) {
        return GradleRunner.create()
            .withProjectDir(projectDir)
            .withPluginClasspath()
            .withArguments(args)
            .forwardOutput()
    }

    private void assertNoDeadLinks() {
        assert linkErrors.exists()
        assert linkErrors.text.stripTrailing().endsWith('All clear!')
    }