code: def test_floats_unequal(self):
      try:
          self.assertEqual(3.5, 4.5)
      except AssertionError as e:
          if not str(e).startswith(
              "Floats not almost equal to 6 decimals"
          ):
              raise self.failureException(
                  "Float mismatch error not raised."
              )
  
imports: import numpy
  from holoviews.core import BoundingBox
  from holoviews.element.comparison import ComparisonTestCase
label_desc: Use image node_id 4 for calling the SimpleComparisonTest obj's underlying member method code with example usage: obj.test_floats_unequal() without return types