doctest is a new C++ testing framework but is by far the fastest both in compile times (by orders of magnitude) and runtime compared to other feature-rich alternatives. It brings the ability of compiled languages such as D / Rust / Nim to have tests written directly in the production code thanks to a fast, transparent and flexible test runner with a clean interface. - DOCtest

see also

• C++ TestMate - run unit Test inside VSCode
• Basic C++ unit testing with coverage using Catch2 and Gcov
  • gcov
  • Code coverage testing of C/C++ projects using Gcov and LCOV
  • Gcov Viewer (vscode)

DOCtest

doctest is modeled after Catch and some parts of the code have been taken directly - feature comparison:

• much faster to compile than catch below
• (+) support meson build system
• (+) subcase test (like catch2 scenarios).
• (+) can be used alongside production code.
  • Using asserts out of a testing context
• (+) decorators

• (+) vscode integration through C++ TestMate

• (-) missing Matchers

Catch2

a multi-paradigm test framework for C++. - Catch2 / v2 to v3 / The Coding Nest Command line

• Pros
  • Header only
  • support Nested initialising section as well as BDD syntax
  • default and custom Matchers
  • main() code can be customized
• Cons
  • slow compilation => see v2 to v3 for improvment
  • No Mocks

Google Test