Async Task Error Handling

AsyncTaskErrorHandling.swift

func load(path: String) -> ThrowableTask<NSData> {
    return ThrowableTask {
        switch path {
        case "profile.png":
            return NSData()
        case "index.html":
            return NSData()
        default:
            throw Error.NotFound
        }
    }
}

expect{try load("profile.png").await()}.notTo(throwError())
expect{try load("index.html").await()}.notTo(throwError())
expect{try load("random.txt").await()}.to(throwError())