code: def setUp(self):
      self.element1 = Element(None, group="Value", label="Label")
      self.element2 = Element(None, group="Value", label="")
  
file_path: holoviews/holoviews/tests/core/test_prettyprint.py
imports: from holoviews import Curve, Element, Layout, Overlay, Store
  from holoviews.core.pprint import PrettyPrinter
  from holoviews.element.comparison import ComparisonTestCase
  from .test_dimensioned import CustomBackendTestCase, ExampleElement
label_desc: Use image node_id 1 for calling the PrettyPrintTest obj's underlying member method code with example usage: obj.setUp() without return types