Update `post_id` test code to validate the JSON spec
Update `post_id` test code to validate the JSON spec

opencivicdata/pupa,rshorey/pupa,mileswwatkins/pupa,opencivicdata/pupa,mileswwatkins/pupa,rshorey/pupa,influence-usa/pupa,influence-usa/pupa,datamade/pupa,datamade/pupa