class_docstr: This tests the ComparisonTestCase class which is an important
  component of other tests.
class_docstr_tok: ["This","tests","the","ComparisonTestCase","class","which","is","an","important","component","of","other","tests","."]
code: def test_unequal_arrays(self):
      try:
          self.assertEqual(self.mat1, self.mat2)
          raise AssertionError("Array mismatch not raised")
      except AssertionError as e:
          if not str(e).startswith(
              "Image not almost equal to 6 decimals\n"
          ):
              raise self.failureException(
                  "Image data mismatch error not raised."
              )
  
imports: import numpy
  from holoviews import Image
  from holoviews.core import BoundingBox, Dimension
  from holoviews.core.element import HoloMap
  from holoviews.element.comparison import ComparisonTestCase
label_desc: Use image node_id 2 for calling the BasicRasterComparisonTest obj's underlying member method code with example usage: obj.test_unequal_arrays() without return types