@TempDir
    File temporaryFolder

    protected File sourceFolder

    def setup() {
        sourceFolder = Files.createTempDirectory(temporaryFolder.toPath(), null).toFile()
    }

    List<File> toSourceFiles(List<String> bodies) {
        return bodies.collect { toSourceFile(it) }.flatten()
    }

    List<File> toSourceFile(String body) {
        def packageGroup = (body =~ /(?s).*?(?:package) (\w+).*/)