def test_3d_matrix(self, mock_cof):
self.mock_width.return_value = 3
mock_cof.side_effect = [16, -23, 42]
matrix = Matrix([4, -3, 1], [2, -1, 2], [1, 5, 7])
self.assertEqual(matrix.determinant(), 175)
mock_cof.assert_any_call(0, 0)
mock_cof.assert_any_call(0, 1)
mock_cof.assert_any_call(0, 2)
def test_2d_matrix(self):
self.mock_width.return_value = 2
matrix = Matrix([1, 2], [3, 4])
self.assertEqual(matrix.determinant(), -2)
def test_matrix_must_be_square(self):
matrix = Matrix([1, 2], [3, 4])
self.mock_square.return_value = False
with self.assertRaises(ValueError):
matrix.determinant()
