Python 2: Lesson 3: Test Driven Development: Test Example - still failes: adder has not been implemented yet
Python 2: Lesson 3: Test Driven Development: Test Example - still failes: stub adder
Python 2: Lesson 3: Test Driven Development: Test Example - still failes: stupid implementation
Python 2: Lesson 3: Test Driven Development: Test Example - still failes: not so stupid implementation
Python 2: Lesson 3: Test Driven Development: Test Example - still failes: fixed failing test
Python 2: Lesson 2: unitteting: refactoring for easier maintenance