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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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Toc

TDD in existing projects

You most probably already have projects that have been implemented without any tests. It is much harder to add tests to an existing project than it is to write them first. When you don't keep in mind that you need to write a test for code sometime in the future, the code itself will become hard to test. It is often easier to tie the different parts of the app together, instead of keeping them separated with a clear and defined interface to each other. As a result, it becomes hard to separate microfeatures in order to test them with unit tests. In addition to this, testing methods with many side effects can be cumbersome to deal with.

When writing the tests initially, you will automatically think about the tests. The code naturally becomes easier to test and more modular.

Back to your existing projects. What could you do to add tests? The way to go...

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