function it_should_dispatch_an_event_when_a_message_is_verified(Verifier $verifier, EventDispatcher $eventDispatcher)
{
$verifier->verify(Argument::type('Mdb\\PayPal\\Ipn\\Message'))->willReturn(true);
$eventDispatcher->dispatch(Listener::IPN_VERIFIED_EVENT, Argument::type('Mdb\\PayPal\\Ipn\\Event\\MessageVerifiedEvent'))->shouldBeCalled();
$this->listen();
}