namespace App\Tests\Controller;

use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;

class MailControllerTest extends WebTestCase
{
public function testMailIsSentAndContentIsOk()
{
$client = static::createClient();

// enables the profiler for the next request (it does nothing if the profiler is not available)
$client->enableProfiler();

$crawler = $client->request('POST', '/path/to/above/action');

$mailCollector = $client->getProfile()->getCollector('swiftmailer');

// checks that an email was sent
$this->assertSame(1, $mailCollector->getMessageCount());

$collectedMessages = $mailCollector->getMessages();
$message = $collectedMessages[0];

// Asserting email data
$this->assertInstanceOf('Swift_Message', $message);
$this->assertSame('Hello Email', $message->getSubject());
$this->assertSame('send@example.com', key($message->getFrom()));
$this->assertSame('recipient@example.com', key($message->getTo()));
$this->assertSame(
'You should see me from the profiler!',
$message->getBody()
);
}
}