code: def setUp(self):
      self.array1 = np.array([(0, 1, 2), (3, 4, 5)])
  
imports: import numpy
  from holoviews.element import HSV, RGB, Curve, Image, QuadMesh, Raster
  from holoviews.element.comparison import ComparisonTestCase
label_desc: Use image node_id 1 for calling the TestRaster obj's underlying member method code with example usage: obj.setUp() without return types