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# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
# For details: https://github.com/PyCQA/pylint/blob/main/LICENSE
# Copyright (c) https://github.com/PyCQA/pylint/graphs/contributors
import contextlib
from typing import Any, Callable, Iterator, Optional, Union
import astroid
from astroid import nodes
from astroid.manager import AstroidManager
from astroid.nodes.node_classes import AssignAttr, Name
from pylint.checkers import stdlib
from pylint.testutils import CheckerTestCase
@contextlib.contextmanager
def _add_transform(
manager: AstroidManager,
node: type,
transform: Callable,
predicate: Optional[Any] = None,
) -> Iterator:
manager.register_transform(node, transform, predicate)
try:
yield
finally:
manager.unregister_transform(node, transform, predicate)
class TestStdlibChecker(CheckerTestCase):
CHECKER_CLASS = stdlib.StdlibChecker
def test_deprecated_no_qname_on_unexpected_nodes(self) -> None:
"""Test that we don't crash on nodes which don't have a qname method.
While this test might seem weird since it uses a transform, it's actually testing a crash
that happened in production, but there was no way to retrieve the code for which this
occurred (how an AssignAttr got to be the result of a function inference beats me...)
"""
def infer_func(
node: Name, context: Optional[Any] = None # pylint: disable=unused-argument
) -> Iterator[Union[Iterator, Iterator[AssignAttr]]]:
new_node = nodes.AssignAttr(attrname="alpha", parent=node)
yield new_node
manager = astroid.MANAGER
transform = astroid.inference_tip(infer_func)
with _add_transform(manager, nodes.Name, transform):
node = astroid.extract_node(
"""
call_something()
"""
)
with self.assertNoMessages():
self.checker.visit_call(node)
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