Deal with UseMocks in tests

[masojus]

We should consider how best to handle UseMocks and if it still has a place in the tests. The main use case is to occasionally run tests against a real server to validate that params/return values/error messages/etc. haven't changed on the real back end. However, this isn't always practical, due to delays in info showing up in queries, and features like Datasets that can take some time to demonstrate changes in data, etc.