def test_create_identity_matrix(self):
m = create_identity_matrix(2);
self.assertEqual(m.size.height, 2)
self.assertEqual(m.size.width, 2)
self.assertEqual(m.get(1, 1), 1)
self.assertEqual(m.get(1, 2), 0)
self.assertEqual(m.get(2, 1), 0)
self.assertEqual(m.get(2, 2), 1)
def test_multiplication_with_identity_matrix(self):
# a * I = a
a = parse_matrix("1 2 3;4 5 6;7 8 9")
I = create_identity_matrix(3)
self.assertEqual(a, a * I)
self.assertEqual(a, I * a)
