dir.createDir()

        when:
        fails("build")

        then:
        assertNoProjectCaches(dir)
        failure.assertHasDescription("Execution failed for task ':build'.")
        failure.assertHasCause("Directory '$dir' does not contain a Gradle build.")
    }

    private void assertNoProjectCaches(TestFile dir) {
        def dirContents = dir.list()
        if (dirContents) {