11 best C++ Unit Testing libraries in 2025

Unit testing is the first level of software testing where individual units/ components of a software are tested. The purpose is to validate that each unit of the software performs as designed. A unit is the smallest testable part of any software. It usually has one or a few inputs and usually a single output. Good code coverage does not guarantee your software is bug-free, but it does determine that your code has been executed during a test run. In this list, we list down 11 best C++ Unit Testing Open Source libraries that you can use in your project. Such as Catch2 - A modern, Cnative, headeronly, test framework for unittests, TDD and BDD using C11, C14, C17 and later; cpputest - CppUTest unit testing and mocking framework for C/C++; unittest-cpp | A lightweight unit testing framework for C++.