I filled out a Travel form for MA online before I left SXM agreeing to self-quarantine for 14 days unless I was coming from several NE states which are low risk. If I test negative for the virus, I do not have to quarantine. There was no rule about having the test prior to arrival when I completed the form on Friday, and no one was checking at the airport last night when I arived.
I intend to make some calls tomorrow to see about getting the test where I can get the results in less than 14 days. If this is possible, I will do so; otherwise, I will quarantine. My PCP will only order a test with quick results if I have symptoms - which I do not.