SecondMessage example

public function testItReturnsTheSenderBasedOnTheMessageClass()
    {
        $sender = $this->createMock(SenderInterface::class);
        $sendersLocator = $this->createContainer([
            'my_sender' => $sender,
        ]);
        $locator = new SendersLocator([
            DummyMessage::class => ['my_sender'],
        ], $sendersLocator);

        $this->assertSame(['my_sender' => $sender], iterator_to_array($locator->getSenders(new Envelope(new DummyMessage('a')))));
        $this->assertSame([], iterator_to_array($locator->getSenders(new Envelope(new SecondMessage()))));
    }

    public function testItReturnsTheSenderBasedOnTransportNamesStamp()
    {
        $mySender = $this->createMock(SenderInterface::class);
        $otherSender = $this->createMock(SenderInterface::class);
        $sendersLocator = $this->createContainer([
            'my_sender' => $mySender,
            'other_sender' => $otherSender,
        ]);
        $locator = new SendersLocator([