def test_input_unchanged(self):
m1 = [[6, 6], [3, 1]]
m2 = [[1, 2], [3, 4]]
m1_original = deepcopy(m1)
m2_original = deepcopy(m2)
matrix_add(m1, m2)
self.assertEqual(m1, m1_original)
self.assertEqual(m2, m2_original)
def test_two_by_two_matrixes(self):
m1 = [[6, 6], [3, 1]]
m2 = [[1, 2], [3, 4]]
m3 = [[7, 8], [6, 5]]
self.assertEqual(matrix_add(m1, m2), m3)
def test_two_by_three_matrixes(self):
m1 = [[1, 2, 3], [4, 5, 6]]
m2 = [[-1, -2, -3], [-4, -5, -6]]
m3 = [[0, 0, 0], [0, 0, 0]]
self.assertEqual(matrix_add(m1, m2), m3)
def test_single_items(self):
self.assertEqual(matrix_add([[5]], [[-2]]), [[3]])