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Merge pull request #1484 from Lotterleben/extend_contributing 

contributing.md: Add build instructions
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@ -1,8 +1,8 @@
<a id="top"></a>
# Contributing to Catch
So you want to contribute something to Catch? That's great! Whether it's a bug fix, a new feature, support for
additional compilers - or just a fix to the documentation - all contributions are very welcome and very much appreciated.
So you want to contribute something to Catch? That's great! Whether it's a bug fix, a new feature, support for
additional compilers - or just a fix to the documentation - all contributions are very welcome and very much appreciated.
Of course so are bug reports and other comments and questions.
If you are contributing to the code base there are a few simple guidelines to keep in mind. This also includes notes to
@ -16,7 +16,7 @@ Ongoing development is currently on _master_. At some point an integration branc
## Directory structure
_Users_ of Catch primarily use the single header version. _Maintainers_ should work with the full source (which is still,
_Users_ of Catch primarily use the single header version. _Maintainers_ should work with the full source (which is still,
primarily, in headers). This can be found in the `include` folder. There are a set of test files, currently under
`projects/SelfTest`. The test app can be built via CMake from the `CMakeLists.txt` file in the root, or you can generate
project files for Visual Studio, XCode, and others (instructions in the `projects` folder). If you have access to CLion,
@ -37,20 +37,42 @@ as these are managed by the scripts!__
## Testing your changes
Obviously all changes to Catch's code should be tested. If you added new functionality, you should add tests covering and
showcasing it. Even if you have only made changes to Catch internals (ie you implemented some performance improvements),
you should still test your changes.
Obviously all changes to Catch's code should be tested. If you added new
functionality, you should add tests covering and showcasing it. Even if you have
only made changes to Catch internals (i.e. you implemented some performance
improvements), you should still test your changes.
This means 3 things
This means 2 things
* Compiling Catch's SelfTest project -- code that does not compile is evidently incorrect. Obviously, you are not expected to
have access to all compilers and platforms Catch supports, Catch's CI pipeline will compile your code using supported compilers
once you open a PR.
* Running the SelfTest binary. There should be no unexpected failures on simple run.
* Running Catch's approval tests. Approval tests compare current output of the SelfTest binary in various configurations against
known good output. Catch's repository provides utility scripts `approvalTests.py` to help you with this. It needs to be passed
the SelfTest binary compiled with your changes, like so: `$ ./scripts/approvalTests.py clang-build/SelfTest`. The output should
be fairly self-explanatory.
* Compiling Catch's SelfTest project:
```
$ cd Catch2
$ cmake -Bdebug-build -H. -DCMAKE_BUILD_TYPE=Debug
$ cmake --build debug-build
```
because code that does not compile is evidently incorrect. Obviously,
you are not expected to have access to all the compilers and platforms
supported by Catch2, but you should at least smoke test your changes
on your platform. Our CI pipeline will check your PR against most of
the supported platforms, but it takes an hour to finish -- compiling
locally takes just a few minutes.
* Running the tests via CTest:
```
$ cd debug-build
$ ctest -j 2 --output-on-failure
```
If you added new tests, approval tests are very likely to fail. If they
do not, it means that your changes weren't run as part of them. This
_might_ be intentional, but usually is not.
The approval tests compare current output of the SelfTest binary in various
configurations against known good outputs. The reason it fails is,
_usually_, that you've added new tests but have not yet approved the changes
they introduce. This is done with the `scripts/approve.py` script, but
before you do so, you need to check that the introduced changes are indeed
intentional.