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116 lines
5.1 KiB
Markdown
<a id="top"></a>
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# Contributing to Catch
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**Contents**<br>
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[Branches](#branches)<br>
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[Directory structure](#directory-structure)<br>
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[Testing your changes](#testing-your-changes)<br>
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[Code constructs to watch out for](#code-constructs-to-watch-out-for)<br>
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So you want to contribute something to Catch? That's great! Whether it's a bug fix, a new feature, support for
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additional compilers - or just a fix to the documentation - all contributions are very welcome and very much appreciated.
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Of course so are bug reports and other comments and questions.
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If you are contributing to the code base there are a few simple guidelines to keep in mind. This also includes notes to
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help you find your way around. As this is liable to drift out of date please raise an issue or, better still, a pull
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request for this file, if you notice that.
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## Branches
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Ongoing development is currently on _master_. At some point an integration branch will be set-up and PRs should target
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that - but for now it's all against master. You may see feature branches come and go from time to time, too.
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## Directory structure
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_Users_ of Catch primarily use the single header version. _Maintainers_ should work with the full source (which is still,
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primarily, in headers). This can be found in the `include` folder. There are a set of test files, currently under
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`projects/SelfTest`. The test app can be built via CMake from the `CMakeLists.txt` file in the root, or you can generate
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project files for Visual Studio, XCode, and others (instructions in the `projects` folder). If you have access to CLion,
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it can work with the CMake file directly.
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As well as the runtime test files you'll also see a `SurrogateCpps` directory under `projects/SelfTest`.
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This contains a set of .cpp files that each `#include` a single header.
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While these files are not essential to compilation they help to keep the implementation headers self-contained.
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At time of writing this set is not complete but has reasonable coverage.
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If you add additional headers please try to remember to add a surrogate cpp for it.
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The other directories are `scripts` which contains a set of python scripts to help in testing Catch as well as
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generating the single include, and `docs`, which contains the documentation as a set of markdown files.
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__When submitting a pull request please do not include changes to the single include, or to the version number file
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as these are managed by the scripts!__
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## Testing your changes
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Obviously all changes to Catch's code should be tested. If you added new
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functionality, you should add tests covering and showcasing it. Even if you have
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only made changes to Catch internals (i.e. you implemented some performance
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improvements), you should still test your changes.
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This means 2 things
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* Compiling Catch's SelfTest project:
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```
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$ cd Catch2
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$ cmake -Bdebug-build -H. -DCMAKE_BUILD_TYPE=Debug
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$ cmake --build debug-build
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```
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because code that does not compile is evidently incorrect. Obviously,
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you are not expected to have access to all the compilers and platforms
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supported by Catch2, but you should at least smoke test your changes
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on your platform. Our CI pipeline will check your PR against most of
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the supported platforms, but it takes an hour to finish -- compiling
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locally takes just a few minutes.
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* Running the tests via CTest:
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```
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$ cd debug-build
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$ ctest -j 2 --output-on-failure
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```
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If you added new tests, approval tests are very likely to fail. If they
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do not, it means that your changes weren't run as part of them. This
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_might_ be intentional, but usually is not.
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The approval tests compare current output of the SelfTest binary in various
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configurations against known good outputs. The reason it fails is,
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_usually_, that you've added new tests but have not yet approved the changes
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they introduce. This is done with the `scripts/approve.py` script, but
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before you do so, you need to check that the introduced changes are indeed
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intentional.
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## Code constructs to watch out for
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This section is a (sadly incomplete) listing of various constructs that
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are problematic and are not always caught by our CI infrastructure.
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### Naked exceptions and exceptions-related function
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If you are throwing an exception, it should be done via `CATCH_ERROR`
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or `CATCH_RUNTIME_ERROR` in `catch_enforce.h`. These macros will handle
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the differences between compilation with or without exceptions for you.
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However, some platforms (IAR) also have problems with exceptions-related
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functions, such as `std::current_exceptions`. We do not have IAR in our
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CI, but luckily there should not be too many reasons to use these.
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However, if you do, they should be kept behind a
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`CATCH_CONFIG_DISABLE_EXCEPTIONS` macro.
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### Unqualified usage of functions from C's stdlib
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If you are using a function from C's stdlib, please include the header
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as `<cfoo>` and call the function qualified. The common knowledge that
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there is no difference is wrong, QNX and VxWorks won't compile if you
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include the header as `<cfoo>` and call the function unqualified.
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----
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_This documentation will always be in-progress as new information comes
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up, but we are trying to keep it as up to date as possible._
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---
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[Home](Readme.md#top)
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