given:
        buildFile << """
        plugins {
            id 'java'
            id 'elasticsearch.internal-licenseheaders'
        }
        """
        dualLicensedFile()
        unknownSourceFile()
        unapprovedSourceFile()

        when:
        def result = gradleRunner("licenseHeaders").buildAndFail()

        then:
        result.task(":licenseHeaders").outcome == TaskOutcome.FAILED