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Programming is learned by writing programs. But code reading is said to be another good way of learning. I would like to improve my unit-testing skills by reading, examining real-world code. Could you recommend any open source projects where the source is extensively tested with unit tests?
I'm interested in code written in C++.
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Yes. Your unit tests should be a separate project, which compiles to its own DLL. Save this answer.
The purpose of a unit test in software engineering is to verify the behavior of a relatively small piece of software, independently from other parts. Unit tests are narrow in scope, and allow us to cover all cases, ensuring that every single part works correctly.
Unit testing may not be possible in all situations. When object-oriented software is considered, the concept of unit testing changes. Encapsulation drives the definition of classes and objects. This means that each class and each instance of a class packages attributes and the operations that manipulate these data.
Avoid Test Interdependence You, therefore, cannot count on the test suite or the class that you're testing to maintain state in between tests. But that won't always make itself obvious to you. If you have two tests, for instance, the test runner may happen to execute them in the same order each time.
AFAIK C++ Boost libraries - http://boost.org/ - have broadly covered code base, and a policy that every new piece of code must have unit tests with it. Might be worth checking.
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The Chromium project.
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