green for 1 to 1000
refactor
refactor
started tdd_2
green for 1
green for 100
refactor
refactor
green for 1000
refactor
refactor
red for 10000
green for 10000
green for 1,000,000
refactor
refactor
green for 10,000,000
green for 100,000,000
green for 1-19
refactor