code: def test_dimension_comparison_names_unequal(self):
      try:
          self.assertEqual(self.dimension1, self.dimension2)
      except AssertionError as e:
          self.assertEqual(
              str(e), "Dimension names mismatched: dim1 != dim2"
          )
  
imports: from holoviews.core import Dimension, Dimensioned
  from holoviews.element.comparison import ComparisonTestCase
label_desc: Use image node_id 5 for calling the DimensionsComparisonTestCase obj's underlying member method code with example usage: obj.test_dimension_comparison_names_unequal() without return types