minor #17968 [PHPUnitBridge] Add an example for SYMFONY_PHPUNIT_REQUIRE (HypeMC)

This PR was merged into the 5.4 branch. Discussion ---------- [PHPUnitBridge] Add an example for `SYMFONY_PHPUNIT_REQUIRE` Adds an example of how to use the `SYMFONY_PHPUNIT_REQUIRE` env variable. Commits ------- 3528249 [PhpUnitBridge] Add an example for SYMFONY_PHPUNIT_REQUIRE

Author: javiereguiluz

components/phpunit_bridge.rst

@@ -938,18 +938,27 @@ If you have installed the bridge through Composer, you can run it by calling e.g
  then set the ``SYMFONY_PHPUNIT_REMOVE`` env var to ``symfony/yaml``.
 
  It's also possible to set this env var in the ``phpunit.xml.dist`` file.
- 
+
 .. tip::
 
  It is also possible to require additional packages that will be installed along
- the rest of the needed PHPUnit packages using the ``SYMFONY_PHPUNIT_REQUIRE``
+ with the rest of the needed PHPUnit packages using the ``SYMFONY_PHPUNIT_REQUIRE``
  env variable. This is specially useful for installing PHPUnit plugins without
- having to add them to your main ``composer.json`` file.
+ having to add them to your main ``composer.json`` file. The required packages
+ need to be separated with a space.
 
-.. versionadded:: 5.3
+ .. code-block:: xml
+
+ <!-- phpunit.xml.dist -->
+ <!-- ... -->
+ <php>
+ <env name="SYMFONY_PHPUNIT_REQUIRE" value="vendor/name:^1.2 vendor/name2:^3"/>
+ </php>
+
+ .. versionadded:: 5.3
 
- The ``SYMFONY_PHPUNIT_REQUIRE`` env variable was introduced in
- Symfony 5.3.
+  The ``SYMFONY_PHPUNIT_REQUIRE`` env variable was introduced in
+  Symfony 5.3.
 
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