class_docstr: Mirrors the magic tests in TestOptsMagic
code: def setUp(self):
      self.backend = Store.current_backend
      Store.current_backend = "matplotlib"
      self.store_copy = OptionTree(
          sorted(Store.options().items()), groups=Options._option_groups
      )
      super().setUp()
  
imports: from unittest import SkipTest
  from pyviz_comms import CommManager
  from holoviews import Store, notebook_extension
  from holoviews.core.options import OptionTree
  from holoviews.element.comparison import ComparisonTestCase
  from holoviews.plotting import bokeh, mpl
  from holoviews.util import Options, OutputSettings, opts, output
  from ..utils import LoggingComparisonTestCase
label_desc: Use image node_id 1 for calling the TestOptsUtil obj's underlying member method code with example usage: obj.setUp() without return types