getReferenceFilePath.swift

private func getReferenceFilePath() throws -> URL {
  let fileURL = URL(fileURLWithPath: #file, isDirectory: false)
  let referenceFileDirectotyURL = fileURL
    .deletingLastPathComponent().deletingLastPathComponent()
    .appendingPathComponent("ReferenceFolder")
    
  let referenceFileURL = referenceFileDirectotyURL
    .appendingPathComponent("referenceFile")
    .appendingPathExtension("json")
    
  guard FileManager.default.fileExists(atPath: referenceFileURL.path) else {
    throw IconTestError.unableToFindFileAtReferencePath
  }

  return referenceFileURL
}