How to do proper database testing (TDD) on Rails 3 using MongoDB and Mongoid

Question

How would go about writing proper unit testing (and integration testing for that matter) using MongoDB through Mongoid on Rails ?

I am asking, because to the opposite of

Answer 1

This one worked for me.

In spec_helper.rb, under RSpec.configure do |config| I put:

config.before :each do
   Mongoid.purge!
end

Reference.