def test_merge_sort_reflexive(self):
assert merge_sort(merge_sort(self.standard_list)) == merge_sort(self.standard_list)
assert merge_sort(merge_sort(self.negative_list)) == merge_sort(self.negative_list)
assert merge_sort(merge_sort([])) == merge_sort([])
def test_merge_sort_functionality(self):
assert merge_sort(self.standard_list) == sorted(self.standard_list)
assert merge_sort(self.negative_list) == sorted(self.negative_list)
def test_merge_sort_edge_cases(self):
assert merge_sort([]) == sorted([])
assert merge_sort([0]) == sorted([0])
assert merge_sort([0, 0]) == sorted([0, 0])
assert merge_sort([0, 0, 0]) == sorted([0, 0, 0])
