class_docstr: For testing of basic composite element types
class_docstr_tok: ["For","testing","of","basic","composite","element","types"]
code: def setUp(self):
      self.data1 = "An example of arbitrary data"
      self.data2 = "Another example..."
      self.data3 = "A third example."
  
      self.view1 = Element(self.data1, label="View1")
      self.view2 = Element(self.data2, label="View2")
      self.view3 = Element(self.data3, label="View3")
      self.hmap = HoloMap({0: self.view1, 1: self.view2, 2: self.view3})
  
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 1 for calling the CompositeTest obj's underlying member method code with example usage: obj.setUp() without return types