minor symfony#16427 Update unit_testing.rst (fzsys)

wouterj · wouterj · commit 300cf4357c6b · 2022-01-25T14:13:50.000+01:00
This PR was submitted for the 6.0 branch but it was merged into the 4.4 branch instead. Discussion ---------- Update unit_testing.rst  Commits ------- a76494f Update unit_testing.rst
diff --git a/create_framework/unit_testing.rst b/create_framework/unit_testing.rst
@@ -8,8 +8,13 @@ on it will exhibit the same bugs. The good news is that whenever you fix a
 bug, you are fixing a bunch of applications too.
 
 Today's mission is to write unit tests for the framework we have created by
-using `PHPUnit`_. Create a PHPUnit configuration file in
-``example.com/phpunit.xml.dist``:
+using `PHPUnit`_. At first, install PHPUnit as a development dependency:
+
+.. code-block:: terminal
+
+    $ composer require --dev phpunit/phpunit
+
+Then, create a PHPUnit configuration file in ``example.com/phpunit.xml.dist``:
 
 .. code-block:: xml
 
