def draw_shape_endpoint(request_json: object) -> None:
# TODO: Eliminate need to use cast() here
shape = cast(Optional[Shape], trycast(Shape, request_json))
if shape is not None:
draw_shape(shape)
else:
shapes_drawn.append(HTTP_400_BAD_REQUEST)
def test_alias_to_dict_with_forwardrefs(self) -> None:
# dict with forward refs
# TODO: Find way to auto-resolve forward references
# inside collection types.
self.assertRaises(
# TODO: Check the error message. Make it reasonable,
# explaining the forward references could not be resolved.
TypeError,
lambda: trycast(tests_forwardrefs_example.PointForLabel,
{'Target': dict(x=50, y=50)}))
# dict with forward refs that have been resolved
self.assertTryCastSuccess(
eval_type(tests_forwardrefs_example.PointForLabel,
tests_forwardrefs_example.__dict__, None),
{'Target': dict(x=50, y=50)})
def test_alias_to_union_with_forwardrefs(self) -> None:
# Union with forward refs
# TODO: Find way to auto-resolve forward references
# inside Union types.
self.assertRaises(
# TODO: Check the error message. Make it reasonable,
# explaining the forward references could not be resolved.
TypeError,
lambda: trycast(
tests_forwardrefs_example.Shape,
dict(type='circle', center=dict(x=50, y=50), radius=25)))
# Union with forward refs that have been resolved
self.assertTryCastSuccess(
eval_type(tests_forwardrefs_example.Shape,
tests_forwardrefs_example.__dict__, None),
dict(type='circle', center=dict(x=50, y=50), radius=25))
def assertTryCastNoneSuccess(self, tp: object) -> None:
self.assertIs(None, trycast(tp, None, _FAILURE))
def assertTryCastFailure(self, tp: object, value: object) -> None:
self.assertIs(None, trycast(tp, value))
def assertTryCastSuccess(self, tp: object, value: object) -> None:
self.assertIs(value, trycast(tp, value))
def test_tuple_of_types(self) -> None:
self.assertRaises(TypeError, lambda: trycast(
(int, str), 1)) # type: ignore
def test_none(self) -> None:
self.assertRaises(TypeError,
lambda: trycast(None, None)) # type: ignore