red test on whether calculator class exists
green test on whether calculator class exists
red test on whether calculator instance exists
green test on whether calculator instance exists
red test on calculator set to zero
green test on calculator set to zero
red test on errors for high numbers
green test on errors for high numbers
red test on returning the nubmer 40
green test on returning the number 40
red test on returning the number of 10s
green test on returning number of 10s (FINALLY getting string to repetat correctly)
red test on returning the value 9
green test on returning the value 9
red test on counting fives
green test on counting fives
red test on returning Roman numeral 4
green test on returning Roman numeral 4
red test on counting the correct number of ones
green on counting ones / red on rejecting zero