Power Assert shows each value of variables and method calls in the expression. It is useful for testing, providing which value wasn't correct when the condition is not satisfied.
Shared contexts to the rescue!
Generate mocks from ActiveRecord models for unit tests that run fast because they don’t need to load Rails or a database.
Faking data can result in test failures.
Great run down of what to test in Rails.
What good tests can do.
The definition of different types of tests.
How to use the different methods of test doubles.
Create more than just objects with FactoryGirl.
By one problem at a time.