In this post, we shall see how protocols work with unit testing.
Say, you have a downloader class DownloadFileClass for fetching network data. It follows the protocol DownloadFileProtocol. The whole class and protocol looks like this.
protocol DownloadFileProtocol {
func downloadFile(with name: String, completion: (String) -> ())
}
class DownloadFileClass {
var downloadedFile: