Currently we run integration tests against the 2.6.X, 3.0.X and 3.2.X releases of MongoDB.

We should also run against 3.4.X - this is tricky as the test harness is difficult to work with.

If anyone wants to take a crack at it we're happy to host the binaries as we do for the other versions, see travis.yml - just leave a message below and we'll get the latest version uploaded.