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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**](doc/markdown/benchmarks.md)) and runtime compared to other feature-rich alternatives. It brings the ability of compiled languages such as [**D**](https://dlang.org/spec/unittest.html) / [**Rust**](https://doc.rust-lang.org/book/second-edition/ch11-00-testing.html) / [**Nim**](https://nim-lang.org/docs/unittest.html) to have tests written directly in the production code thanks to a fast, transparent and flexible test runner with a clean interface.

[![Standard](https://img.shields.io/badge/c%2B%2B-11/14/17/20-blue.svg)](https://en.wikipedia.org/wiki/C%2B%2B#Standardization)
[![License](https://img.shields.io/badge/license-MIT-blue.svg)](https://opensource.org/licenses/MIT)
[![Version](https://badge.fury.io/gh/onqtam%2Fdoctest.svg)](https://github.com/onqtam/doctest/releases)
[![download](https://img.shields.io/badge/download%20%20-link-blue.svg)](https://raw.githubusercontent.com/onqtam/doctest/master/doctest/doctest.h)
[![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/503/badge)](https://bestpractices.coreinfrastructure.org/projects/503)
[![Language grade: C/C++](https://img.shields.io/lgtm/grade/cpp/g/onqtam/doctest.svg)](https://lgtm.com/projects/g/onqtam/doctest/context:cpp)
[![Join the chat at https://gitter.im/onqtam/doctest](https://badges.gitter.im/onqtam/doctest.svg)](https://gitter.im/onqtam/doctest?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
[![Try it online](https://img.shields.io/badge/try%20it-online-orange.svg)](https://wandbox.org/permlink/nJIibfbivG7BG7r1)
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The framework is and will stay free but needs your support to sustain its development. There are lots of <a href="doc/markdown/roadmap.md"><b>new features</b></a> 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.

[<img src="https://www.paypalobjects.com/en_US/i/btn/btn_donate_LG.gif" align="right">](https://www.paypal.me/onqtam/10)

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

![cover-example](scripts/data/using_doctest_888px_wide.gif)

There are many C++ testing frameworks - [Catch](https://github.com/catchorg/Catch2), [Boost.Test](http://www.boost.org/doc/libs/1_64_0/libs/test/doc/html/index.html), [UnitTest++](https://github.com/unittest-cpp/unittest-cpp), [cpputest](https://github.com/cpputest/cpputest), [googletest](https://github.com/google/googletest) and many [other](https://en.wikipedia.org/wiki/List_of_unit_testing_frameworks#C.2B.2B).

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**](doc/markdown/benchmarks.md#cost-of-including-the-header) and writing [**thousands of asserts**](doc/markdown/benchmarks.md#cost-of-an-assertion-macro)
- Doesn't produce any warnings even on the [**most aggressive**](scripts/cmake/common.cmake#L84) warning levels for **MSVC**/**GCC**/**Clang**
- Offers a way to remove **everything** testing-related from the binary with the [**```DOCTEST_CONFIG_DISABLE```**](doc/markdown/configuration.md#doctest_config_disable) identifier
- [**thread-safe**](doc/markdown/faq.md#is-doctest-thread-aware) - asserts (and logging) can be used from multiple threads spawned from a single test case - [**example**](examples/all_features/concurrency.cpp)
- asserts can be used [**outside of a testing context**](doc/markdown/assertions.md#using-asserts-out-of-a-testing-context) - as a general purpose assert library - [**example**](examples/all_features/asserts_used_outside_of_tests.cpp)
- Doesn't pollute the global namespace (everything is in namespace ```doctest```) and doesn't drag **any** headers with it
- Very [**portable**](doc/markdown/features.md#extremely-portable) C++11 (use tag [**1.2.9**](https://github.com/onqtam/doctest/tree/1.2.9) for C++98) with over 180 different CI builds (static analysis, sanitizers...)
- binaries (exe/dll) can use the test runner of another binary - so tests end up in a single registry - [**example**](examples/executable_dll_and_plugin/)

![cost-of-including-the-framework-header](scripts/data/benchmarks/header.png)

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 considered 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 or up-to-date comments - showing the use of APIs
- Testing internals that are not exposed through the public API and headers is no longer a mind-bending exercise
- [**Test-driven development**](https://en.wikipedia.org/wiki/Test-driven_development) in C++ has never been easier!

The framework can be used like any other if you don't want/need to mix production code and tests - check out the [**features**](doc/markdown/features.md).

**doctest** is modeled after [**Catch**](https://github.com/catchorg/Catch2) and some parts of the code have been taken directly - check out [**the differences**](doc/markdown/faq.md#how-is-doctest-different-from-catch).

[This table](https://github.com/martinmoene/catch-lest-other-comparison) compares **doctest** / [**Catch**](https://github.com/catchorg/Catch2) / [**lest**](https://github.com/martinmoene/lest) which are all very similar.

Checkout the [**CppCon 2017 talk**](https://cppcon2017.sched.com/event/BgsI/mix-tests-and-production-code-with-doctest-implementing-and-using-the-fastest-modern-c-testing-framework) on [**YouTube**](https://www.youtube.com/watch?v=eH1CxEC29l8) to get a better understanding of how the framework works and read about how to use it in [**the JetBrains article**](https://blog.jetbrains.com/rscpp/better-ways-testing-with-doctest/) - 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**](https://github.com/onqtam/doctest/issues/252). There is also an [**older article**](https://accu.org/var/uploads/journals/Overload137.pdf) in the february edition of ACCU Overload 2017.

[![CppCon 2017 talk about doctest on youtube](scripts/data/youtube-cppcon-talk-thumbnail.png)](https://www.youtube.com/watch?v=eH1CxEC29l8)

Documentation
-------------

Project:

- [Features and design goals](doc/markdown/features.md) - the complete list of features
- [Roadmap](doc/markdown/roadmap.md) - upcoming features
- [Benchmarks](doc/markdown/benchmarks.md) - compile-time and runtime supremacy
- [Contributing](CONTRIBUTING.md) - how to make a proper pull request
- [Changelog](CHANGELOG.md) - generated changelog based on closed issues/PRs

Usage:

- [Tutorial](doc/markdown/tutorial.md) - make sure you have read it before the other parts of the documentation
- [Assertion macros](doc/markdown/assertions.md)
- [Test cases, subcases and test fixtures](doc/markdown/testcases.md)
- [Parameterized test cases](doc/markdown/parameterized-tests.md)
- [Command line](doc/markdown/commandline.md)
- [Logging macros](doc/markdown/logging.md)
- [```main()``` entry point](doc/markdown/main.md)
- [Configuration](doc/markdown/configuration.md)
- [String conversions](doc/markdown/stringification.md)
- [Reporters](doc/markdown/reporters.md)
- [Extensions](doc/markdown/extensions.md)
- [FAQ](doc/markdown/faq.md)
- [Build systems](doc/markdown/build-systems.md)
- [Examples](examples)

Contributing
------------

[<img src="https://cloud.githubusercontent.com/assets/8225057/5990484/70413560-a9ab-11e4-8942-1a63607c0b00.png" align="right">](http://www.patreon.com/onqtam)

Support the development of the project with donations! There is a list of planned features which are all important and big - see the [**roadmap**](doc/markdown/roadmap.md). I took a break from working in the industry to make open source software so every cent is a big deal.

[<img src="https://www.paypalobjects.com/en_US/i/btn/btn_donate_LG.gif" align="right">](https://www.paypal.me/onqtam/10)

If you work for a company using **doctest** or have the means to do so, please consider financial support.

Contributions in the form of issues and pull requests are welcome as well - check out the [**Contributing**](CONTRIBUTING.md) page.

Stargazers over time
------------

[![Stargazers over time](https://starcharts.herokuapp.com/onqtam/doctest.svg)](https://starcharts.herokuapp.com/onqtam/doctest)

Logo
------------

The [logo](scripts/data/logo) is licensed under a Creative Commons Attribution 4.0 International License. Copyright &copy; 2019 [area55git](https://github.com/area55git) &nbsp; [![License: CC BY 4.0](https://licensebuttons.net/l/by/4.0/80x15.png)](https://creativecommons.org/licenses/by/4.0/)

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