This repository contains a simple way to mock Mgo driver.
If you're interested in it, you can find an article here : http://thylong.com/golang/2016/mocking-mongo-in-golang/
$ git clone git@github.com:thylong/mongo_mock_go_example.git
If you want to test only the mock, you can run it this way :
$ go get github.com/thylong/mongo_mock_go_example
$ go run main.go
If you want to test both the connection to Mongo and the mock, you can use the docker-compose file.
The code was tested with versions 1.7.* of Go.