What tests will be required of me by employer before i can start work?

I have H1B visa. My question is if their is pre employment medical exam done required by my employer in the US? If so, what tests are inlcuded? Is their a chest xray? And what blood tests would be required of me? How about drug testing? Im from the Philippines by the way and i just want to make sure i wont encounter any problem when i come to the US