Re-enable test on doctrine command

It will slow down the whole test suite (because it'll use doctrine command).
Remove unecessary `KernelTestCase`.
Also rename `AbstractControllerTest` to `WallabagApiTestCase` for consistency.

src/Wallabag/ApiBundle/Tests/WallabagApiTestCase.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace Wallabag\ApiBundle\Tests;
+
+use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
+use Symfony\Component\BrowserKit\Cookie;
+
+abstract class WallabagApiTestCase extends WebTestCase
+{
+    /**
+     * @var Client
+     */
+    protected $client = null;
+
+    public function setUp()
+    {
+        $this->client = $this->createAuthorizedClient();
+    }
+
+    /**
+     * @return Client
+     */
+    protected function createAuthorizedClient()
+    {
+        $client = static::createClient();
+        $container = $client->getContainer();
+
+        /** @var $userManager \FOS\UserBundle\Doctrine\UserManager */
+        $userManager = $container->get('fos_user.user_manager');
+        /** @var $loginManager \FOS\UserBundle\Security\LoginManager */
+        $loginManager = $container->get('fos_user.security.login_manager');
+        $firewallName = $container->getParameter('fos_user.firewall_name');
+
+        $user = $userManager->findUserBy(array('username' => 'admin'));
+        $loginManager->loginUser($firewallName, $user);
+
+        // save the login token into the session and put it in a cookie
+        $container->get('session')->set('_security_'.$firewallName, serialize($container->get('security.token_storage')->getToken()));
+        $container->get('session')->save();
+
+        $session = $container->get('session');
+        $client->getCookieJar()->set(new Cookie($session->getName(), $session->getId()));
+
+        return $client;
+    }
+}