I really don't recommend trial and error as a logical way of testing ecstasy tablets with a completely unknown content. You don't even seem to have anecdotal reports from a dealer or friend who might have done them.
All hope is not lost if you don't have or can't afford a testing kit. This website www.ecstasydata.org has ecstasy tablet testing results from people who sent in pills with a co-pay. Perhaps someone in your location sent in a pill of that batch.
You could also try www.pillreports.com for world-wide reports of ecstasy tablets with ratings and possibly results from somebody with a testing kit.
Neither of these websites can definitively identify a tablet as containing MDMA because way too many pills are pressed by different suppliers. Lets say you had some blue dolphins, ecstasydata.org may list some blue dolphins as containing MDMA but that doesn't mean you have the same batch as the one's they tested. In any case it is better than taking a complete stab in the dark.