Fixed everything

Author: javiereguiluz

testing.rst

@@ -161,15 +161,15 @@ As an example, a test could look like this::
     To run your functional tests, the ``WebTestCase`` class needs to know which
     is the application kernel to bootstrap it. The kernel class is usually
     defined in the ``KERNEL_CLASS`` environment variable (included in the
-    default ``phpunit .xml-dist`` file provided by Symfony):
+    default ``phpunit.xml.dist`` file provided by Symfony):
 
     .. code-block:: xml
 
         <?xml version="1.0" charset="utf-8" ?>
         <phpunit>
             <php>
                 <!-- the value is the FQCN of the application kernel -->
-                <server name="KERNEL_CLASS" value="App\Kernel" />
+                <env name="KERNEL_CLASS" value="App\Kernel" />
             </php>
             <!-- ... -->
         </phpunit>

testing/bootstrap.rst

@@ -20,7 +20,7 @@ To do this, first add a file that executes your bootstrap work::
 
     require __DIR__.'/../vendor/autoload.php';
 
-Then, configure ``phpunit.xml.dist`` to execute this ``bootstra.php`` file
+Then, configure ``phpunit.xml.dist`` to execute this ``bootstrap.php`` file
 before running the tests:
 
 .. code-block:: xml

testing/database.rst

@@ -112,33 +112,16 @@ Most of the time you want to use a dedicated database connection to make sure
 not to overwrite data you entered when developing the application and also
 to be able to clear the database before every test.
 
-To do this, you can specify a database configuration which overwrites the default
-configuration just in the ``test`` environment:
-
-.. configuration-block::
-
-    .. code-block:: yaml
-
-        # config/packages/test/doctrine.yaml
-        doctrine:
-            # ...
-            dbal:
-                url: 'mysql://USERNAME:PASSWORD@127.0.0.1/DB_NAME?charset=utf8mb4&serverVersion=5.7'
-
-    .. code-block:: xml
-
-        <!-- config/packages/test/doctrine.xml -->
-        <doctrine:config>
-            <doctrine:dbal
-                url="mysql://USERNAME:PASSWORD@127.0.0.1/DB_NAME?charset=utf8mb4&serverVersion=5.7"
-            />
-        </doctrine:config>
-
-    .. code-block:: php
-
-        // config/packages/test/doctrine.php
-        $container->loadFromExtension('doctrine', array(
-            'dbal' => array(
-                'url' => 'mysql://USERNAME:PASSWORD@127.0.0.1/DB_NAME?charset=utf8mb4&serverVersion=5.7',
-            ),
-        ));
+To do this, you can override the value of the ``DATABASE_URL`` env var in the
+``phpunit.xml.dist`` to use a diferent database for your tests:
+
+.. code-block:: xml
+
+    <?xml version="1.0" charset="utf-8" ?>
+    <phpunit>
+        <php>
+            <!-- the value is the Doctrine connection string in DSN format -->
+            <env name="DATABASE_URL" value="mysql://USERNAME:PASSWORD@127.0.0.1/DB_NAME?charset=utf8mb4&serverVersion=5.7" />
+        </php>
+        <!-- ... -->
+    </phpunit>