Problem: dependency

Symptom: duplication

1. Write failing test BEFORE writing any code

2. Remove duplication

get to green ASAP, quick&dirty:

• Pattern: Fake it until you make it

• Pattern: TDD Obvious Implementation

tests driving code:

• Pattern: Triangulation

Results:

• organic design

• vs over-engineered code

• courage

• vs fear

• self testing code

Split up

• design

• getting code to work

because they are conflicting activities

Pattern: Make the change easy. Then make the easy change. copy

Pattern: put a bad feeling into a test