Method test_signatures

Lib/test/test_zoneinfo/test_zoneinfo.py:439–450

Ensure that C module has valid method signatures.

(self)

    @unittest.skipIf(MISSING_C_DOCSTRINGS,
                     "Signature information for builtins requires docstrings")
    def test_signatures(self):
        """Ensure that C module has valid method signatures."""
        import inspect

        must_have_signatures = (
            self.klass.clear_cache,
            self.klass.no_cache,
            self.klass.from_file,
        )
        for method in must_have_signatures:
            with self.subTest(method=method):
                inspect.Signature.from_callable(method)

    def test_fold_mutate(self):
        """Test that fold isn't mutated when no change is necessary.