(Stolen from http://kata-log.rocks/baby-steps)
- Setup a git repository (or use another SCM that supports resets)
- Setup a timer for 2 minutes interval when you start
- Write exactly one test
- If the timer rings and the test is red then revert and start over
- If you finish your test earlier: no problem, reset the timer and continue
- Restart timer
- Go to 3.
(Stolen from https://github.com/garora/TDD-Katas)
To try and encourage more sales of the 5 different Harry Potter books they sell, a bookshop has decided to offer discounts of multiple-book purchases.
One copy of any of the five books costs 8 EUR.
If, however, you buy two different books, you get a 5% discount on those two books.
If you buy 3 different books, you get a 10% discount.
If you buy 4 different books, you get a 20% discount.
If you go the whole hog, and buy all 5, you get a huge 25% discount.
Note that if you buy, say, four books, of which 3 are different titles, you get a 10% discount on the 3 that form part of a set, but the fourth book still costs 8 EUR.
Your mission is to write a piece of code to calculate the price of any conceivable shopping basket (containing only Harry Potter books), giving as big a discount as possible.
For example, how much does this basket of books cost?
2 copies of the first book 2 copies of the second book 2 copies of the third book 1 copy of the fourth book 1 copy of the fifth book
Answer: 51.60 EUR