As trab said if it is crystallized you can warm it up. If you keep it out of light it will last a long time, easily 5 years. Even if it has begun to breakdown it's not going to hurt you to use it, the esters will breakdown before the testosterone but as long as they haven't been exposed to oxygen (particularly O3) that process will be quite slow. Even a punctured vial will probably be decent for 5 years. If you don't see/feel results with it get some new test.