2015-13.py: Test find_best_happiness with known data
2015-13.py: Test find_best_happiness with known data

robjwells/adventofcode-solutions,robjwells/adventofcode-solutions,robjwells/adventofcode-solutions,robjwells/adventofcode-solutions,robjwells/adventofcode-solutions,robjwells/adventofcode-solutions