from merge_sort import *
assert merge_sort([1, 5, 6, 40, 41, 3, 9]) == [1, 3, 5, 6, 9, 40, 41]
assert merge_sort([0, 0, 0, 1, 0, 1]) == [0, 0, 0, 0, 1, 1]
assert merge_sort([6, 5, 10, 11, 1, 0, 0]) == [0, 0, 1, 5, 6, 10, 11]
