Add test for Swiftmailer adapter as the default one

src/Bundle/tests/Functional/DefaultSenderTest.php

@@ -0,0 +1,57 @@
+<?php
+
+/*
+ * This file is part of the Sylius package.
+ *
+ * (c) Paweł Jędrzejewski
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Sylius\Bundle\MailerBundle\tests\Functional;
+
+use Sylius\Bundle\MailerBundle\tests\Provider\MessagesProvider;
+use Sylius\Bundle\MailerBundle\tests\Purger\SentMessagesPurger;
+use Sylius\Component\Mailer\Sender\SenderInterface;
+use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
+
+final class DefaultSenderTest extends KernelTestCase
+{
+    private SenderInterface $sender;
+
+    private MessagesProvider $messagesProvider;
+
+    private string $spoolDirectory;
+
+    protected function setUp(): void
+    {
+        self::bootKernel(['environment' => 'test']);
+        $container = self::getContainer();
+
+        $this->sender = $container->get('sylius.email_sender');
+        $this->spoolDirectory = $container->getParameter('kernel.cache_dir') . '/spool/default';
+        $this->messagesProvider = new MessagesProvider($this->spoolDirectory);
+    }
+
+    /** @test */
+    public function it_sends_email_rendered_with_given_template(): void
+    {
+        $this->sender->send('test_email', ['[email protected]']);
+
+        $messages = $this->messagesProvider->getMessages();
+
+        $this->assertCount(1, $messages);
+        $this->assertStringContainsString('Test email subject', $messages[0]->getSubject());
+        $this->assertStringContainsString('Test email body', $messages[0]->getBody());
+    }
+
+    protected function tearDown(): void
+    {
+        parent::tearDown();
+
+        (new SentMessagesPurger($this->spoolDirectory))->purge();
+    }
+}