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import sys
from typing import Iterator
import pytest
if sys.version_info < (3, 9):
from typing_extensions import Literal
else:
from typing import Literal
from annotated_types import BaseMetadata, GroupedMetadata, Gt
def test_subclass_without_implementing_iter() -> None:
with pytest.raises(TypeError):
class Foo1(GroupedMetadata):
pass
class Foo2(GroupedMetadata):
def __iter__(self) -> Iterator[BaseMetadata]:
raise NotImplementedError
with pytest.raises(NotImplementedError):
for _ in Foo2():
pass
def test_non_subclass_implementer() -> None:
class Foo:
__is_annotated_types_grouped_metadata__: Literal[True] = True
def __iter__(self) -> Iterator[BaseMetadata]:
return
yield Gt(0)
_: GroupedMetadata = Foo() # type checker will fail if not valid
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