April 2015
Intermediate to advanced
264 pages
5h 31m
English
Content preview from Test Driven Python DevelopmentBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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The importance of tests
The Extract Class refactoring shows the importance of having a good unit test suite as well as running it frequently during the refactoring. It is easy to overlook small things when moving code around, which could end up breaking the code. By running the tests often, we know immediately when we break something. This makes it easy to fix the mistake. Had we done the whole refactoring before running the tests, it would have not been clear which step in the refactoring broke the tests, and we would have to go back and debug the whole refactoring.
One more thing that we need to do is to adjust the tests after the refactoring is complete. In some refactorings, such as Extract Class, we may find that we have to also move tests ...
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