How to test email sending in PHPUnit?

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composer require phpunit/phpunit
composer require symfony/mailer
composer require symfony/event-dispatcher

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use SymfonyComponentMailerTestConstraintEmailSent;
use SymfonyComponentMailerTestEmailAssertions;
use SymfonyComponentMailerTestInterceptorEmailInterceptor;
use SymfonyComponentMailerTestTransportNullTransport;
use SymfonyComponentMimeEmail;
use PHPUnitFrameworkTestCase;

class EmailSendingTest extends TestCase
{
    // ...

    protected function setUp(): void
    {
        EmailAssertions::setMailerTransport(new NullTransport());
    }

    public function testEmailSending()
    {
        // Create an instance of the email you want to send
        $email = new Email();
        $email->from('[email protected]')
              ->to('[email protected]')
              ->subject('Test email')
              ->text('This is a test email');

        // Send the email
        $emailInterceptor = new EmailInterceptor();
        $emailInterceptor->intercept($email);
        $emailInterceptor->flush();

        // Assert that the email was sent
        $this->assertThat(new EmailSent($email), new EmailSentConstraint());
    }
}

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vendor/bin/phpunit