return fmt.Sprintf("Expected `%s' to not be a directory", actual)
}

var _ = Describe("tarballCompressor", func() {
	var (
		dstDir     string
		cmdRunner  boshsys.CmdRunner
		fs         boshsys.FileSystem
		compressor Compressor
	)

	BeforeEach(func() {
		logger := boshlog.NewLogger(boshlog.LevelNone)
		cmdRunner = boshsys.NewExecCmdRunner(logger)
		fs = boshsys.NewOsFileSystem(logger)
		tmpDir, err := fs.TempDir("tarballCompressor-test")
		Expect(err).NotTo(HaveOccurred())
		dstDir = filepath.Join(tmpDir, "TestCompressor")
		compressor = NewTarballCompressor(cmdRunner, fs)
	})

	BeforeEach(func() {
		fs.MkdirAll(dstDir, os.ModePerm)
	})

	AfterEach(func() {
		fs.RemoveAll(dstDir)
	})

	Describe("CompressFilesInDir", func() {
		It("compresses the files in the given directory", func() {