def test_get_default_supplied(self):
target = Field(default="123")
self.assertEqual("123", target.get_default())
def test_get_default_callable(self):
target = Field(default=lambda: "321")
self.assertEqual("321", target.get_default())
def test_get_default(self):
target = Field()
self.assertIsNone(target.get_default())
