code: def test_snippet(self):
      class Parser(HTMLParser):
          state = "initial"
          states = []
  
          def handle_starttag(self, tag, attrs):
              attrs = dict(attrs)
              if (
                  tag == "script"
                  and attrs.get("type", "")
                  == "application/vnd.jupyter.widget-state+json"
              ):
                  self.state = "widget-state"
                  self.states.append(self.state)
              elif (
                  tag == "script"
                  and attrs.get("type", "")
                  == "application/vnd.jupyter.widget-view+json"
              ):
                  self.state = "widget-view"
                  self.states.append(self.state)
  
          def handle_endtag(self, tag):
              self.state = "initial"
  
          def handle_data(self, data):
              if self.state == "widget-state":
                  manager_state = json.loads(data)["state"]
                  assert len(manager_state) == 3
                  self.states.append("check-widget-state")
              elif self.state == "widget-view":
                  view = json.loads(data)
                  assert isinstance(view, dict)
                  self.states.append("check-widget-view")
  
      w = IntText(4)
      state = dependency_state(w, drop_defaults=True)
      snippet = embed_snippet(views=w, drop_defaults=True, state=state)
      parser = Parser()
      parser.feed(snippet)
      print(parser.states)
      assert parser.states == [
          "widget-state",
          "check-widget-state",
          "widget-view",
          "check-widget-view",
      ]
  
imports: from io import StringIO
  from html.parser import HTMLParser
  import json
  import os
  import re
  import tempfile
  import shutil
  import traitlets
  from ipywidgets.widgets import IntSlider, IntText, Text, Widget, jslink, HBox, widget_serialization, widget
  from ipywidgets.embed import embed_data, embed_snippet, embed_minimal_html, dependency_state
label_desc: Use image node_id 7 for calling the TestEmbed obj's underlying member method code with example usage: obj.test_snippet() without return types