dragosmg commented on a change in pull request #12140:
URL: https://github.com/apache/arrow/pull/12140#discussion_r784124285
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File path: docs/source/developers/guide/step_by_step/testing.rst
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@@ -62,29 +62,103 @@ In this section we outline steps needed for unit testing
in Arrow.
If the tests start failing, try to recompile
PyArrow or C++.
-
+
.. note::
**Recompiling Cython**
If you only make changes to `.py` files, you do not need to
recompile PyArrow. However, you should recompile it if you make
changes in `.pyx` or `.pxd` files.
-
+
To do that run this command again:
.. code:: console
$ python setup.py build_ext --inplace
.. note::
-
+
**Recompiling C++**
Similarly, you will need to recompile the C++ code if you have
made changes to any C++ files. In this case,
- re-run the cmake commands again.
+ re-run the cmake commands again.
.. tab:: R tests
- .. TODO
+ We use `testthat <https://testthat.r-lib.org/index.html>`_ for unit
testing in R. More specifically, we use the `3rd edition of testthat
<https://testthat.r-lib.org/articles/third-edition.html>`_. On rare occasions
we might want the behaviour of the 2nd edition of testthat, which is indicated
by ``testthat::local_edition(2)``.
+
+ **Structure**
+
+ Expect the usual testthat folder structure:
+
+ .. code-block:: R
+
+ tests
+ ├── testthat # unit test files live here
Review comment:
Done
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