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++.
Thanks in advance.
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.
The Bazaar version control system is obsessive about automated testing. Unit testing, feature testing, integration testing, blackbox testing, test doubles testing, testing framework testing, parameterized test suites, platform-specific tests, etc.
This has all sorts of nice consequences for the project, but I must refrain here from undue VCS fanboying.
EDIT: oops, I did not notice you said you were interested in C++. Bazaar is a Python project.
The trucov project is an open source tool used to verify unit test coverage. The tool itself is extensively unit tested using google's test framework.
Disclaimer: though I did not write the project myself I did mentor the students who did.