def test_accepts_float(self):
field = USDCurrencyType()
self.assertEqual(field.convert(100),100.00)
def test_accepts_string_with_dollar(self):
field = USDCurrencyType()
self.assertEqual(field.convert('$100.00'),100.00)
def test_raises_error_none(self):
field = USDCurrencyType()
with self.assertRaises(ConversionError):
field.convert("PIGGY")
