func checkVolumeContents(targetDir, tcName string, payload map[string]FileProjection, t *testing.T) {
	dataDirPath := filepath.Join(targetDir, dataDirName)
	// use filepath.Walk to reconstruct the payload, then deep equal
	observedPayload := make(map[string]FileProjection)
	visitor := func(path string, info os.FileInfo, _ error) error {
		if info.IsDir() {
			return nil
		}

		relativePath := strings.TrimPrefix(path, dataDirPath)