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Document setting TEST_GENERATE_FIXTURES=1 to update snapshots #21525

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12 changes: 12 additions & 0 deletions contributing/code/tests.rst
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Expand Up @@ -64,6 +64,18 @@ what's going on and if the tests are broken because of the new code.
On Windows, install the `Cmder`_, `ConEmu`_, `ANSICON`_ or `Mintty`_ free applications
to see colored test results.

Testing Generated Code
----------------------

Some tests generate code on the fly and check that it matches expected stored in
in a file. To regenerate those files, you can use the following approach, run
the tests with the environment variable ``TEST_GENERATE_FIXTURES`` set to ``1``:

.. code-block:: terminal

$ TEST_GENERATE_FIXTURES=1 php ./phpunit src/Symfony/Component/Config/Tests/Builder/GeneratedConfigTest.php


.. _`install Composer`: https://getcomposer.org/download/
.. _Cmder: https://cmder.app/
.. _ConEmu: https://conemu.github.io/
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