Unit-testing frameworks
The previous section proves that it isn't extremely complicated to write a tiny unit-testing driver. It wasn't pretty, but believe it or not, professional developers actually do like to reinvent the wheel (theirs will be fancier, rounder, and faster than the legacy one). Don't fall into this trap: you'll create so much boilerplate that it could become a separate project. Introducing a popular unit-test framework to your solution aligns it to a standard that transcends projects and companies and will get you free updates and extensions for cheap. You can't lose.
How do we add a unit-testing framework to our project? Well, write tests in implementation files according to the chosen framework's rules and link these tests with a test runner provided by the framework. Test runners are your entry points that will start the execution of selected tests. Unlike the basic unit_tests.cpp file we saw earlier in the chapter, many of them...
