The most recent resync of JSON tests from the specs repo includes:

https://github.com/mongodb/specifications/pull/262

These tests fail with "authentication failed":

https://evergreen.mongodb.com/task/mongo_c_driver_darwin_test_dns_darwinssl_62dffa714abb9a5b3ef0cc010905d15c1450c32a_18_11_02_15_14_21

The test runner probably needs to a) create a user on the test replica set or b) run the auth tests against a differently-configured mongo-orchestration replica set than the non-auth tests. Option "a" is preferable.