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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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Author (1):
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Dr. Dominik Hauser Dr. Dominik Hauser
Author Profile Icon Dr. Dominik Hauser
Dr. Dominik Hauser
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Summary

In this chapter, we wrote tests using test expectations provided by XCTest. We also used stubs to fake a server. We took a look at how both ways bring us closer to our goal--a finished app with as few bugs as possible.

We used dependency injection to catch the completion handler of the session data task in our fake URL session. This way, we could feed test data into the implementation code and assert that the code is implemented as expected. As we controlled the data that the completion handler received, we were able to simulate all kinds of errors and drive the implementation of the correct error handling.

In the following chapter, we will put the different parts of the last few chapters together and finally see the app running.

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