Move testing page to repo

CONTRIBUTING.md

@@ -99,8 +99,9 @@ If possible, you should also add tests for the things you write.
 However, this is not always possible, for example when working on modules.
 But at least isolated components should be tested.
 
-See the [testing page](https://github.com/polybar/polybar/wiki/Testing) on the
-wiki for more information.
+See the [testing
+page](https://polybar.readthedocs.io/en/latest/dev/testing.html) in the
+documentation.
 Also don't hesitate to ask for help, testing isn't that mature in polybar yet
 and some things may be harder/impossible to test right now.
 
@@ -154,7 +155,8 @@ repo.
 
 ### Style
 
-Please read our [style guide](https://github.com/polybar/polybar/wiki/Style-Guide).
+Please read our [style
+guide](https://polybar.readthedocs.io/en/latest/dev/style-guide.html).
 
 ## Donations
 

doc/dev/style-guide.rst

@@ -11,7 +11,7 @@ We use ``clang-format`` for code formatting, the style rules are defined in
 ``.clang-format``, before submitting a PR, make sure to run the following command
 on all the C++ files you changed:
 
-.. code-block:: bash
+.. code-block:: shell
 
   clang-format -style=file -i <FILES>
 

doc/dev/testing.rst

@@ -0,0 +1,26 @@
+Testing
+=======
+
+Polybar uses `googletest <https://google.github.io/googletest/>`_ as its
+testing and mocking framework.
+Tests live in the ``tests/`` directory; they can be enabled during cmake with
+``-DBUILD_TESTS=ON`` and compiled with ``make all_unit_tests``.
+
+Each test gets its own executable in ``build/tests``, which can be executed to run
+a specific test.
+
+Running all tests is preferably done with the following command:
+
+.. code-block:: shell
+
+  make check
+
+This runs all available tests and prints the output in color for failed tests
+only.
+
+Adding New Tests
+----------------
+
+All new tests need to be added to the ``tests/CMakeLists.txt`` file. Have a look
+at the other unit tests in ``tests/unit_tests`` to see how to write tests for your
+code.

doc/index.rst

@@ -34,6 +34,7 @@ Welcome to the official polybar documentation.
    :caption: Developer Documentation:
 
    dev/style-guide
+   dev/testing
    dev/release-workflow
 
 Getting Help