EmailIsQueued example

        self::assertThat(self::getMessageMailerEvents(), new MailerConstraint\EmailCount($count, $transport), $message);
    }

    public static function assertQueuedEmailCount(int $count, string $transport = null, string $message = ''): void
    {
        self::assertThat(self::getMessageMailerEvents(), new MailerConstraint\EmailCount($count, $transport, true), $message);
    }

    public static function assertEmailIsQueued(MessageEvent $event, string $message = ''): void
    {
        self::assertThat($event, new MailerConstraint\EmailIsQueued(), $message);
    }

    public static function assertEmailIsNotQueued(MessageEvent $event, string $message = ''): void
    {
        self::assertThat($event, new LogicalNot(new MailerConstraint\EmailIsQueued()), $message);
    }

    public static function assertEmailAttachmentCount(RawMessage $email, int $count, string $message = ''): void
    {
        self::assertThat($email, new MimeConstraint\EmailAttachmentCount($count), $message);
    }