Like anywhere else it is an available site for testing. I would go to the RI convention center....those around BOS could go to the airport, have the test, and then return on the day of their flight.. MA is not too traveler friendly with regards to traveler testing and this is an available option for getting a result of an acceptable test in a reasonably short time....and at 75 bucks might be worth it.

Edit: I should add that this is NOT a MA run facility. It is a private company that have the contract....RI is offering travelers convenient testing and at no cost....