def test_merge_sort_1():
arr = [8,4,23,42,16,15]
expected = arr
merge_sort(arr)
actual = printList(arr)
assert expected == actual
def test_merge_sort_33():
arr = [5,12,7,5,5,7]
expected = [5,5,5,7,7,12]
merge_sort(arr)
actual = printList(arr)
assert expected == actual
def test_merge_sort_4():
arr = [2,3,5,7,13,11]
expected = [2,3,5,7,11,13]
merge_sort(arr)
actual = printList(arr)
assert expected == actual
def test_merge_sort_22():
arr = [20,18,12,8,5,-2]
expected = [-2,5,8,12,18,20]
merge_sort(arr)
actual = printList(arr)
assert expected == actual
