code: def tearDown(self):
      Store._custom_options = {
          k: {} for k in Store._custom_options.keys()
      }
      self.ip.run_line_magic("unload_ext", "holoviews.ipython")
      del self.ip
      Store.display_hooks = self.backup
      notebook_extension._loaded = False
      super().tearDown()
  
imports: from holoviews import Curve, Store
  from holoviews.ipython import IPTestCase, notebook_extension
label_desc: Use image node_id 2 for calling the TestDisplayHooks obj's underlying member method code with example usage: obj.tearDown() without return types