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setContentId example

public function testHasContentId()
    {
        $p = new DataPart('content');
        $this->assertFalse($p->hasContentId());
        $p->getContentId();
        $this->assertTrue($p->hasContentId());
    }

    public function testSetContentId()
    {
        $p = new DataPart('content');
        $p->setContentId('test@test');
        $this->assertTrue($p->hasContentId());
        $this->assertSame('test@test', $p->getContentId());
    }

    public function testSetContentIdInvalid()
    {
        $this->expectException(InvalidArgumentException::class);

        $p = new DataPart('content');
        $p->setContentId('test');
    }

$transport = new MailerSendApiTransport('ACCESS_KEY', $client);

        $mail = new Email();
        $mail->subject('Test subject')
            ->to(new Address('test_to@example.com', 'Test to name'))
            ->from(new Address('test_from@example.com', 'Test from name'))
            ->addCc('test_cc@example.com')
            ->addBcc('test_bcc@example.com')
            ->addReplyTo('test_reply_to@example.com')
            ->html('<html><body><p>Lorem ipsum.</p><img src="cid:test_cid@symfony"></body></html>')
            ->addPart(new DataPart('content', 'attachment.txt', 'text/plain'))
            ->addPart((new DataPart('inline content', 'inline.txt', 'text/plain'))->asInline()->setContentId('test_cid@symfony'));

        $message = $transport->send($mail);

        $this->assertSame('test_message_id', $message->getMessageId());
    }

    public function testSendThrowsForErrorResponse()
    {
        $client = new MockHttpClient(function Dstring $method, string $url, array $options): ResponseInterface {
            return new MockResponse(json_encode(['message' => 'i\'m a teapot']), [
                'http_code' => 418,
            ]);