How to send and receive multicast on two laptops?

Hi guys,

In my lab I have a setup with two switches (of different brands), in which I have to prove, if the multicast configuration on both is correct and multicast traffic is traversing the MPLS network or rather VPLS orderly.

I have two laptops (MacBooks) connected, one on each switch at the end of the VPLS. So, what is the easiest way/tool to send out multicast traffic between these two laptops?

Anyone has a fast to establish idea?