Babysitter Kata (from https://gist.github.com/jameskbride/5482722) Background ---------- This kata simulates a babysitter working and getting paid for one night. The rules are pretty straight forward: The babysitter - starts no earlier than 5:00PM - leaves no later than 4:00AM - gets paid $12/hour from start-time to bedtime - gets paid $8/hour from bedtime to midnight - gets paid $16/hour from midnight to end of job - gets paid for full hours (no fractional hours) Feature: As a babysitter In order to get paid for 1 night of work I want to calculate my nightly charge Assumptions ----------- 1. A default bed time is set to 9:00 PM 2. All the time that will be passed in is assumed to be in 24hr format.