croemheld/doctest

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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.

The framework is and will stay free but needs your support to sustain its development. There are lots of new features and maintenance to do. If you work for a company using doctest or have the means to do so, please consider financial support. Monthly donations via Patreon and one-offs via PayPal.

A complete example with a self-registering test that compiles to an executable looks like this:

There are many C++ testing frameworks - Catch, Boost.Test, UnitTest++, cpputest, googletest and others.

The key differences between it and other testing frameworks are that it is light and unintrusive:

Ultra light on compile times both in terms of including the header and writing thousands of asserts
Doesn't produce any warnings even on the most aggressive warning levels for MSVC/GCC/Clang
Can remove everything testing-related from the binary with the DOCTEST_CONFIG_DISABLE identifier
thread-safe - asserts can be used from multiple threads spawned from a single test case - example
asserts can be used outside of a testing context - as a general purpose assert library - example
No global namespace pollution (everything is in doctest::) & doesn't drag any headers with it
Portable C++11 (use tag 1.2.9 for C++98) with over 100 different CI builds (static analysis, sanitizers..)
binaries (exe/dll) can use the test runner of another binary => tests in a single registry - example

This allows the framework to be used in more ways than any other - tests can be written directly in the production code!

Tests can be a form of documentation and should be able to reside near the production code which they test.

This makes the barrier for writing tests much lower - you don't have to: 1) make a separate source file 2) include a bunch of stuff in it 3) add it to the build system and 4) add it to source control - You can just write the tests for a class or a piece of functionality at the bottom of its source file - or even header file!
Tests in the production code can be thought of as documentation/up-to-date comments - showcasing the APIs
Testing internals that are not exposed through the public API and headers is no longer a mind-bending exercise
Test-driven development in C++ has never been easier!

The framework can be used just like any other without mixing production code and tests - check out the features.

doctest is modeled after Catch and some parts of the code have been taken directly - check out the differences.

This table compares doctest / Catch / lest which are all very similar.

Checkout the CppCon 2017 talk on YouTube to get a better understanding of how the framework works and read about how to use it in the JetBrains article - highlighting the unique aspects of the framework! On a short description on how to use the framework along production code you could refer to this GitHub issue. There is also an older article in the february edition of ACCU Overload 2017.