January 2020
Intermediate to advanced
548 pages
13h 36m
English
Content preview from Clean Code in JavaScript
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Encoding changes as tests
We've already explored how we can write tests to discover and specify current functionality, and, in previous chapters, we discussed the obvious benefits of following a Test-Driven-Development (TDD) approach. It follows that we should, when operating in an unfamiliar code base, always confirm our changes via cleanly written tests.
Writing tests alongside your changes is definitely a need when there are no existing tests. Writing the first test in an area of code can be burdensome in terms of setting up libraries and necessary mocks, but it is absolutely worth it.
In our previous example of introducing the capability of rendering videos to GalleryImage, it would be wise to add a simple test to confirm that <VIDEO> ...
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