... Chapter 13. Unit Testing 13.1. Introduction to Roman numerals In previous chapters, you “dived in” by immediately looking at code and trying to understand it as quickly as possible. Now ... Study: Roman Numerals”, but now let's step back and consider what it would take to expand that into a two-way utility. The rules for Roman numerals lead to a number of interesting observations: ... 'MCDLXXXV'), (1509, 'MDIX'), (1607, 'MDCVII'), (1754, 'MDCCLIV'), (183 2, 'MDCCCXXXII'), (1993, 'MCMXCIII'), (2074, 'MMLXXIV'), ...