The lightest feature rich C++ single header testing framework for unit tests and TDD

doctest 1.0.0 released!

From the release:

The doctest library is inspired by the unittest {} functionality of the D programming language and Python's docstrings - tests can be considered a form of documentation and should be able to reside near the production code which they test.

It is modeled after Catch which is currently the most popular and easy to use alternative for testing in C++