This kata simulates a babysitter working and getting paid for one night. The rules are pretty straight forward.

As a babysitter
In order to get paid for 1 night of work
I want to calculate my nightly charge

The babysitter:

• starts no earlier than 5:00PM
• leaves no later than 4:00AM
• only babysits for one family per night
• gets paid for full hours (no fractional hours)
• should be prevented from mistakes when entering times (e.g. end time before start time, or outside of allowable work hours)

The job:

• Pays different rates for each family (based on bedtimes, kids and pets, etc...)
• Family A pays $15 per hour before 11pm, and $20 per hour the rest of the night
• Family B pays $12 per hour before 10pm, $8 between 10 and 12, and $16 the rest of the night
• Family C pays $21 per hour before 9pm, then $15 the rest of the night
• The time ranges are the same as the babysitter (5pm through 4am)

Deliverable:

• Calculate total pay, based on babysitter start and end time, and a family.