You don't know anything about your diet, your caloric/protein intake, you are 120+ lbs., I don't think you can say that you are eating right especially since you said you are looking for mass. 250mg of test ew for 6 weeks won't do much for you. You probably won't notice a thing. I personally wouldn't run a bulk cycle for less than 12 weeks.
For real though, get your diet in order and you should have no probs gaining weight. How tall are you? 127.9 lbs. is real light bro....eat and gain weight naturally.