def test_hex_black(self):
color = Color(rgba=(0.0, 0.0, 0.0, 1.0))
hex_value = color.hex()
self.assertEqual(hex_value, "#000000FF")
def test_hex(self):
color = Color(rgba=(0.4, 0.2, 0.6, 0.8))
hex_value = color.hex()
self.assertEqual(hex_value, "#663399CC")