Minor reword

Author: javiereguiluz

testing.rst

@@ -714,7 +714,18 @@ stores in the session of the test client. If you need to define custom
 attributes in this token, you can use the ``tokenAttributes`` argument of the
 :method:`Symfony\\Bundle\\FrameworkBundle\\KernelBrowser::loginUser` method.
 
-You can also use :class:`Symfony\\Component\\Security\\Core\\User\\InMemoryUser` but you have to define those in the configuration first::
+You can also use an :ref:`in-memory user <security-memory-user-provider>` in your tests
+by instantiating :class:`Symfony\\Component\\Security\\Core\\User\\InMemoryUser` directly::
+
+    // tests/Controller/ProfileControllerTest.php
+    use Symfony\Component\Security\Core\User\InMemoryUser;
+
+    $client = static::createClient();
+    $testUser = new InMemoryUser('admin', 'password', ['ROLE_ADMIN']);
+    $client->loginUser($testUser);
+
+Before doing this, you must define the in-memory user in your test environment
+configuration to ensure it exists and can be authenticated::
 
 .. code-block:: yaml
 
@@ -726,15 +737,6 @@ You can also use :class:`Symfony\\Component\\Security\\Core\\User\\InMemoryUser`
                     users:
                         admin: { password: password, roles: ROLE_ADMIN }
 
-and then log the user with::
-
-    // tests/Controller/ProfileControllerTest.php
-    use Symfony\Component\Security\Core\User\InMemoryUser;
-
-    $client = static::createClient();
-    $testUser = new InMemoryUser('admin', 'password', ['ROLE_ADMIN']);
-    $client->loginUser($testUser);
-
 To set a specific firewall (``main`` is set by default)::
 
     $client->loginUser($testUser, 'my_firewall');