New in Symfony 4.4: PHPUnit Assertions for Email Messages

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// tests/Controller/DefaultControllerTest.php
namespace App\Tests\Controller;

use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;

class DefaultControllerTest extends WebTestCase
{
    public function testSomething()
    {
        $client = static::createClient();
        $client->request('GET', '/newsletter-signup');
        // ...

        $this->assertEmailCount(2);
        $this->assertEmailIsQueued($this->getMailerEvent(0));

        $email = $this->getMailerMessage(0);
        $this->assertEmailHeaderSame($email, 'To', 'fabien@symfony.com');
        $this->assertEmailTextBodyContains($email, 'Welcome to Symfony!');
        $this->assertEmailAttachementCount($email, 1);
    }
}