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Test-Driven iOS Development with Swift 4

You're reading from   Test-Driven iOS Development with Swift 4 Write Swift code that is maintainable, flexible, and easily extensible

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Product type Paperback
Published in Oct 2017
Publisher Packt
ISBN-13 9781788475709
Length 222 pages
Edition 3rd Edition
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Dr. Dominik Hauser Dr. Dominik Hauser
Author Profile Icon Dr. Dominik Hauser
Dr. Dominik Hauser
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Testing Network Code

Most apps in the App Store perform networking in one way or the other. Apple provides a great class for network requests--URLSession. Its requests are asynchronous. This means that the response is delivered on a background thread. If that wasn't the case, the UI would freeze while the app waits for a response from the server.

The main topic of this chapter is how to test an asynchronous API. There are two ways to write tests for asynchronous API calls. First, it can be done using the real server that is going to be used when the app is in the App Store. Second, it can be done using stubs, as we did in the previous chapter.

Both methods have their advantages. Tests with the real server let us additionally test whether the server is implemented as described in the documentation. Those tests are closer to the implementation of the finished app and, therefore...

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