code: def test_composite_unequal_data(self):
      t1 = (self.el1 * self.el2) + (self.el1 * self.el2)
      t2 = (self.el1 * self.el2) + (self.el1 * self.el3)
      try:
          self.assertEqual(t1, t2)
      except AssertionError as e:
          self.assertEqual(str(e), "'data2' != 'data3'")
  
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 13 for calling the CompositeComparisonTestCase obj's underlying member method code with example usage: obj.test_composite_unequal_data() without return types