test_api.py 文件源码

def test_method_called(self):
        # If defined the method should be called.
        class InvalidatingNullFinder:
            def __init__(self, *ignored):
                self.called = False
            def find_module(self, *args):
                return None
            def invalidate_caches(self):
                self.called = True

        key = 'gobledeegook'
        meta_ins = InvalidatingNullFinder()
        path_ins = InvalidatingNullFinder()
        sys.meta_path.insert(0, meta_ins)
        self.addCleanup(lambda: sys.path_importer_cache.__delitem__(key))
        sys.path_importer_cache[key] = path_ins
        self.addCleanup(lambda: sys.meta_path.remove(meta_ins))
        importlib.invalidate_caches()
        self.assertTrue(meta_ins.called)
        self.assertTrue(path_ins.called)