code: def setUp(self):
      self.el1 = Element("data1")
      self.el2 = Element("data2")
      self.el3 = Element("data3")
      self.el4 = Element("data5", group="ValB")
      self.el5 = Element("data6", label="LabelA")
  
file_path: holoviews/holoviews/tests/element/test_comparisoncomposite.py
imports: from holoviews import Element
  from holoviews.element.comparison import ComparisonTestCase
label_desc: Use image node_id 1 for calling the CompositeComparisonTestCase obj's underlying member method code with example usage: obj.setUp() without return types