code: def test_dimension_comparison_labels_unequal(self):
      try:
          self.assertEqual(self.dimension1, self.dimension11)
      except AssertionError as e:
          self.assertEqual(
              str(e),
              "Dimension labels mismatched: dim1 != Test Dimension",
          )
  
imports: from holoviews.core import Dimension, Dimensioned
  from holoviews.element.comparison import ComparisonTestCase
label_desc: Use image node_id 6 for calling the DimensionsComparisonTestCase obj's underlying member method code with example usage: obj.test_dimension_comparison_labels_unequal() without return types