fileInTransactionDir("some-dummy-file.txt").createNewFile()
        fileInTransactionDir("sub-dir").mkdir()

        when:
        assert !hasOnlyDirectories(transactionDir)
        def isTransactionDirEmpty = newCompileTransaction().execute {
            return hasOnlyDirectories(transactionDir)
        }

        then:
        isTransactionDirEmpty
    }

    def "files are stashed and restored on compile failure"() {