.toString()
        return new TestFile(immutableOutputDirPath.toString())
    }

    TestFile gradleUserHomeOutputDir(String from, String to, Closure<String> stream = { output }) {
        outputDir(from, to, this.&gradleUserHomeOutputDirs, stream)
    }

    Set<TestFile> allOutputDirs(String from, String to, Closure<String> stream = { output }) {