Commit79a0a33

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

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	`1`	`+fromimportlibimportimport_module`
	`2`	`+frompkgutilimportwalk_packages`
	`3`	`+`
	`4`	`+importmatplotlib`
	`5`	`+importpytest`
	`6`	`+`
	`7`	`+# Get the names of all matplotlib submodules, except for the unit tests.`
	`8`	`+module_names= [m.nameforminwalk_packages(path=matplotlib.__path__,`
	`9`	`+prefix=f'{matplotlib.__name__}.')`
	`10`	`+ifnotm.name.startswith(__package__)]`
	`11`	`+`
	`12`	`+`
	`13`	`+@pytest.mark.parametrize('module_name',module_names)`
	`14`	`+@pytest.mark.filterwarnings('ignore::DeprecationWarning')`
	`15`	`+deftest_getattr(module_name):`
	`16`	`+"""`
	`17`	`+ Test that __getattr__ methods raise AttributeError for unknown keys.`
	`18`	`+ See #20822, #20855.`
	`19`	`+ """`
	`20`	`+try:`
	`21`	`+module=import_module(module_name)`
	`22`	`+except (ImportError,RuntimeError)ase:`
	`23`	`+# Skip modules that cannot be imported due to missing dependencies`
	`24`	`+pytest.skip(f'Cannot import{module_name} due to{e}')`
	`25`	`+`
	`26`	`+key='THIS_SYMBOL_SHOULD_NOT_EXIST'`
	`27`	`+ifhasattr(module,key):`
	`28`	`+delattr(module,key)`

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