code: def test_output_holomap_scrubber(self):
      self.line_magic("output", "holomap='scrubber'")
      self.assertEqual(
          hv.util.OutputSettings.options.get("holomap", None),
          "scrubber",
      )
  
imports: from unittest import SkipTest
  import holoviews
  from holoviews.core.options import Store
  from pyviz_comms import CommManager
  from holoviews.operation import Compositor
label_desc: Use image node_id 3 for calling the TestOutputMagic obj's underlying member method code with example usage: obj.test_output_holomap_scrubber() without return types