Move to Symfony Flex

The structure changed completely.
Bundles are gone. Everything is flatten in the folder `src`.
I separated import & api controllers to avoid _pollution_ in the main controller folder.

tests/Command/TagAllCommandTest.php

@@ -0,0 +1,53 @@
+<?php
+
+namespace App\Tests\Command;
+
+use App\Tests\WallabagCoreTestCase;
+use Symfony\Bundle\FrameworkBundle\Console\Application;
+use Symfony\Component\Console\Exception\RuntimeException;
+use Symfony\Component\Console\Tester\CommandTester;
+
+class TagAllCommandTest extends WallabagCoreTestCase
+{
+    public function testRunTagAllCommandWithoutUsername()
+    {
+        $this->expectException(RuntimeException::class);
+        $this->expectExceptionMessage('Not enough arguments (missing: "username")');
+
+        $application = new Application($this->getTestClient()->getKernel());
+
+        $command = $application->find('wallabag:tag:all');
+
+        $tester = new CommandTester($command);
+        $tester->execute([]);
+    }
+
+    public function testRunTagAllCommandWithBadUsername()
+    {
+        $application = new Application($this->getTestClient()->getKernel());
+
+        $command = $application->find('wallabag:tag:all');
+
+        $tester = new CommandTester($command);
+        $tester->execute([
+            'username' => 'unknown',
+        ]);
+
+        $this->assertStringContainsString('User "unknown" not found', $tester->getDisplay());
+    }
+
+    public function testRunTagAllCommand()
+    {
+        $application = new Application($this->getTestClient()->getKernel());
+
+        $command = $application->find('wallabag:tag:all');
+
+        $tester = new CommandTester($command);
+        $tester->execute([
+            'username' => 'admin',
+        ]);
+
+        $this->assertStringContainsString('Tagging entries for user admin...', $tester->getDisplay());
+        $this->assertStringContainsString('Done', $tester->getDisplay());
+    }
+}