Per https://jira.mongodb.org/browse/RUBY-1216 it is quite difficult to get compression enabled everywhere, and if compression is not enabled there aren't necessarily any errors being produced. Hence, although we have multiple CI configurations testing compression, we should also have some sort of an integration test which will obviously and reliably fail if any of the pieces aren't working.

Also, the test running documentation (https://github.com/mongodb/mongo-ruby-driver/tree/master/spec#compression) will need to be updated.