if filepath.Ext(d.Name()) == ext {
				matched = true
				break
			}
		}
		if matched {
			res = append(res, filepath.Join(filePath, d.Name()))
		}
	}
	return res, nil
}

func ReadDirOrFail(t test.Failer, filePath string, extensions ...string) []string {
	t.Helper()
	res, err := ReadDir(filePath, extensions...)
	if err != nil {
		t.Fatal(err)
	}
	return res
}