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TST: Add unit test to catch recurrences of #20822, #20855 #20856

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TST: Add unit test to catch recurrences of #20822, #20855 #20856

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28 changes: 28 additions & 0 deletions lib/matplotlib/tests/test_getattr.py
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from importlib import import_module
from pkgutil import walk_packages

import matplotlib
import pytest

# Get the names of all matplotlib submodules, except for the unit tests.
module_names = [m.name for m in walk_packages(path=matplotlib.__path__,
prefix=f'{matplotlib.__name__}.')
if not m.name.startswith(__package__)]


@pytest.mark.parametrize('module_name', module_names)
@pytest.mark.filterwarnings('ignore::DeprecationWarning')
def test_getattr(module_name):
"""
Test that __getattr__ methods raise AttributeError for unknown keys.
See #20822, #20855.
"""
try:
module = import_module(module_name)
except (ImportError, RuntimeError) as e:
# Skip modules that cannot be imported due to missing dependencies
pytest.skip(f'Cannot import {module_name} due to {e}')

key = 'THIS_SYMBOL_SHOULD_NOT_EXIST'
if hasattr(module, key):
delattr(module, key)