class_docstr: For testing of basic composite element types
class_docstr_tok: ["For","testing","of","basic","composite","element","types"]
code: def test_add_operator(self):
      self.assertEqual(type(self.view1 + self.view2), Layout)
  
imports: import numpy
  import pytest
  from holoviews import AdjointLayout, Element, GridSpace, HoloMap, Layout, NdLayout, Overlay
  from holoviews.element import Curve, HLine, Image
  from holoviews.element.comparison import ComparisonTestCase
label_desc: Use image node_id 2 for calling the CompositeTest obj's underlying member method code with example usage: obj.test_add_operator() without return types