def test_infer_missing(self):
actual = DataClassWithOptional.from_json('{}', infer_missing=True)
assert (actual == DataClassWithOptional(None))
def test_optional(self):
assert (DataClassWithOptional.from_json('{"x": 1}') ==
DataClassWithOptional(1))
assert (DataClassWithOptional.from_json('{"x": null}') ==
DataClassWithOptional(None))