tdd: StringCalculator Attempt 03: 1 fails
-add classes
tdd: StringCalculator Attempt 03: 1 passes
tdd: StringCalculator Attempt 03: 1 refactor
tdd: StringCalculator Attempt 03: 2 fails
tdd: StringCalculator Attempt 03: 2 passes
tdd: StringCalculator Attempt 03: 2 refactor
tdd: StringCalculator Attempt 03: 3 fails
tdd: StringCalculator Attempt 03: 3 passes
tdd: StringCalculator Attempt 03: 3 refactor
tdd: StringCalculator Attempt 03: 4 fails
tdd: StringCalculator Attempt 03: 4 passes
tdd: StringCalculator Attempt 03: 4 refactor
tdd: StringCalculator Attempt 03: 5 fails
tdd: StringCalculator Attempt 03: 5 passes
tdd: StringCalculator Attempt 03: 6 fails
tdd: StringCalculator Attempt 03: 6 passes
tdd: StringCalculator Attempt 03: 6 refactor
tdd: StringCalculator Attempt 03: 7 fails
tdd: StringCalculator Attempt 03: 7 passes
tdd: StringCalculator Attempt 03: 7 refactor