code: def test_get_waveform(self):
      item = self.client.get(self.item_url)
      waveform = self.client.get(item.data["waveform_url"])
      self.assertEqual(waveform.status_code, 200)
      self.assertIn("waveform", waveform.data.keys())
  
file_path: TimeSide/timeside/server/tests/test_item.py
imports: from django.test.client import BOUNDARY, MULTIPART_CONTENT, encode_multipart
  from timeside import __file__
  from timeside.server.models import *
  from timeside.server.tests.timeside_test_server import TimeSideTestServer
label_desc: Use image node_id 7 for calling the TestItem obj's underlying member method code with example usage: obj.test_get_waveform() without return types