![]() ![]() For this example, imagine us having an API to get a user by using the endpoint.Server is behind NAT and ports are forwarded correctly. Let sessionManager = Session(configuration: configuration)Īfter that, we can run our test to verify that our mocking URLProtocol is correctly registered. let configuration = URLSessionConfiguration.af.defaultĬonfiguration.protocolClasses = + (configuration.protocolClasses ? ) This is the only part in which we have to change our code implementation as we have to inject the URLProtocol for tests. Mocking Alamofire requests can be done by registering the MockingURLProtocol in your manager. This improves debugging while at the same time preventing you from forgetting to mock a certain test. Whenever a request is executed without a matching Mock, a print statement will be shown: ? No mocked data found for url Optional("") method Optional("GET"). All the interesting setup logic can be found in this Mock struct which includes all specific logic to match your request.Īfter registering the MockingURLProtocol it’s no longer possible for a request to hit the server. Mocks are registered inside a shared instance of the Mocker struct by instantiating a new Mock instance. ![]() In its core, it’s making use of the MockingURLProtocol which is responsible for catching requests and returning registered mocked data. How does it work?īefore we dive into implementation details it’s good to understand how the Mocker framework works. This makes it a robust framework with support for many cases including edge cases like redirects. We’ve been developing it since 2017 and added a lot of features over the years to suit our needs. However, that would require quite some extra explanation of implementation details while we’ve already sorted that out for you in our Mocker framework.Īt WeTransfer we’re using Mocker in all our private and public projects like, for example, GitBuddy. I could dive into writing a custom URLProtocol solution to make it possible to mock requests in this blog post. Introducing Mocker: a framework to simplify the mocking of requests In other words, it allows us to alternate the response before it’s been called. The class allows us to handle the loading but also manipulate the loading of URL data. You can basically add a custom URLProtocol to your URLSession or Alamofire manager which will then be called for every outgoing request.Īn abstract class that handles the loading of protocol-specific URL data. In my blog post Printing data requests using a custom URLProtocol I’ve already explained in more detail how you can use a URLProtocol. What is a URLProtocol and why should I use it for mocking? Learn how mobile observability can put your business in the best position to succeed by joining this free webinar. After all, users abandon apps for many reasons other than crashes and errors. Therefore, we decided to write a code solution that allows us to mock data requests using a URLProtocol and prevents us from touching the actual code implementation.Ĥ Best Ways to Boost E-commerce Revenue in Mobile E-commerce app struggling to hit your revenue targets? Your mobile team lacks the visibility needed to identify the largest revenue-impacting issues. It’s definitely a great technique for writing tests in general but it also requires you to alternate code implementations for the sake of testing. ![]() Also, this allows us to run our tests offline if needed and it takes away flakiness of tests.Īlthough many blog posts suggest using dependency injection for mocking tests, it was not what we ended up doing at WeTransfer. When writing tests, it’s important that we don’t actually run the requests so we don’t mess up our backend database with dummy data. Mocking data requests that are triggered by either Alamofire or URLSession is something we all run into when we start writing tests for our networking layer. 6 min read How to mock Alamofire and URLSession requests in Swift.Introducing Mocker: a framework to simplify the mocking of requests.What is a URLProtocol and why should I use it for mocking?.
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