code: def test_scatter_equal_3(self):
      self.assertEqual(self.scatter3, self.scatter3)
  
imports: import numpy
  from holoviews import Bars, Curve, Dimension, Histogram, Points, Scatter, VectorField
  from holoviews.element.comparison import ComparisonTestCase
label_desc: Use image node_id 4 for calling the ScatterComparisonTest obj's underlying member method code with example usage: obj.test_scatter_equal_3() without return types