May 2014
Intermediate to advanced
258 pages
5h 42m
English
Content preview from Flask Web 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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Chapter 15. Testing
There are two very good reasons for writing unit tests. When implementing new functionality, unit tests are used to confirm that the new code is working in the expected way. The same result can be obtained by testing manually, but of course automated tests save time and effort.
A second, more important reason is that each time the application is modified, all the unit tests built around it can be executed to ensure that there are no regressions in the existing code; in other words, that the new changes did not affect the way the older code works.
Unit tests have been a part of Flasky since the very beginning, with tests designed to exercise specific features of the application implemented in the database model classes. These classes are easy to test outside of the context of a running application, so given that it takes little effort, implementing unit tests for all the features implemented in the database models is the best way to ensure at least that part of the application starts robust and stays that way.
This chapter discusses ways to improve and extend unit testing.
Obtaining Code Coverage Reports
Having a test suite is important, but it is equally important to know how good or bad it is. Code coverage tools measure how much of the application is exercised by unit tests and can provide a detailed report that indicates which parts of the application code are not being tested. This information is invaluable, because it can be used to direct the effort of writing ...
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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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.