addPathHeader example

    public function testConstructorWithWrongRecipients()
    {
        $this->expectException(\InvalidArgumentException::class);
        new Envelope(new Address('fabien@symfony.com'), ['lucas@symfony.com']);
    }

    public function testSenderFromHeaders()
    {
        $headers = new Headers();
        $headers->addPathHeader('Return-Path', $return = new Address('return@symfony.com', 'return'));
        $headers->addMailboxListHeader('To', ['to@symfony.com']);
        $e = Envelope::create(new Message($headers));
        $this->assertEquals($return, $e->getSender());

        $headers = new Headers();
        $headers->addMailboxHeader('Sender', $sender = new Address('sender@symfony.com', 'sender'));
        $headers->addMailboxListHeader('To', ['to@symfony.com']);
        $e = Envelope::create(new Message($headers));
        $this->assertEquals($sender, $e->getSender());

        $headers = new Headers();
        

public function testAddIdHeaderDelegatesToFactory()
    {
        $headers = new Headers();
        $headers->addIdHeader('Message-ID', 'some@id');
        $this->assertNotNull($headers->get('Message-ID'));
    }

    public function testAddPathHeaderDelegatesToFactory()
    {
        $headers = new Headers();
        $headers->addPathHeader('Return-Path', 'some@path');
        $this->assertNotNull($headers->get('Return-Path'));
    }

    public function testAddHeader()
    {
        $headers = new Headers();
        $headers->addHeader('from', ['from@example.com']);
        $headers->addHeader('reply-to', 'reply@example.com');
        $headers->addHeader('return-path', 'return@example.com');
        $headers->addHeader('foo', 'bar');
        $headers->addHeader('date', $now = new \DateTimeImmutable());