March 2003
Intermediate to advanced
288 pages
7h 4m
English
Content preview from Java Extreme Programming CookbookBecome 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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Unit Testing
A unit test is a programmer-written test for a single piece of functionality in an application. Unit tests should be fine grained, testing small numbers of closely-related methods and classes. Unit tests should not test high-level application functionality. Testing application functionality is called acceptance testing, and acceptance tests should be designed by people who understand the business problem better than the programmers.
Why Test?
XP cannot be done without unit testing. Unit tests build confidence that the code works correctly. Tests also provide the safety net enabling pairs of programmers to make changes to any piece of code in the system without fear. Making changes to code written by someone else takes courage, because you might not be familiar with all of the ins-and-outs of the original solution.
Imagine a scenario in which you are presented with a legacy payroll application consisting of 50,000 lines of code and zero unit tests. You have been asked to change the way that part-time employee salaries are computed, due to a recent change in the tax laws. After making the change, how can you be confident that you did not introduce a bug somewhere else in the system? In a traditional model, you hand the application to a quality assurance team that manually tests everything they can think of.[12] Hopefully, everybody gets the correct paycheck next month.
Now imagine the XP scenario. If the original development team used XP, each class would have a suite of ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.