def test_find_next_letter__abd__next_is_c():
pi = PlayerInventory(10)
pi.item_dict = {'a': 1, 'b': 2, 'd': 4}
assert pi.find_next_letter() == 'c'
def test_find_next_letter__first_letter_is_a():
pi = PlayerInventory(10)
assert pi.find_next_letter() == 'a'
