def test_size_odd(self):
arr = [3, 2, 8]
result = merge_sort(arr)
self.assertEquals(result, [2, 3, 8])
def test_size_even(self):
arr = [5, 1, 28, 4]
result = merge_sort(arr)
self.assertEquals(result, [1, 4, 5, 28])
def test_base_case(self):
arr = [1]
result = merge_sort(arr)
self.assertEquals(result, [1])
