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GitHub User: jetsgit
MiniTest has evolved significantly since this tutorial was created. There are changes in configuration, and to help clarify the differences between the 3 main test frameworks I wrote a guide that examines their specific characteristics.
Here is a link to Ruby Reflections where you can find configuration for Rails 4.1 Test::Unit, MiniTest, Rspec, and combined with fixtures or factories. Pattern Objects, mocking, stubbing, and debugging hints are also covered.
Database cleaner is also explained, when it is necessary and when it is not.