def test_color_mutation_doesnt_stray_beyond_bounds(self, mock_rand):
mock_rand.side_effect = [-4, 258, 0]
color = Color(24, 149, 134)
new_color = color.mutate()
mock_rand.assert_any_call(8, 40)
mock_rand.assert_any_call(133, 165)
mock_rand.assert_any_call(118, 150)
self.assertEqual(new_color._r, 0)
self.assertEqual(new_color._g, 255)
self.assertEqual(new_color._b, 0)
def test_can_mutate_color(self, mock_rand):
mock_rand.side_effect = [23, 45, 67]
color = Color(24, 149, 134)
new_color = color.mutate()
mock_rand.assert_any_call(8, 40)
mock_rand.assert_any_call(133, 165)
mock_rand.assert_any_call(118, 150)
self.assertEqual(new_color._r, 23)
self.assertEqual(new_color._g, 45)
self.assertEqual(new_color._b, 67)