class_docstr: Test id and label.
class_docstr_tok: ["Test","id","and","label","."]
docstr: Test label method returns CosineWindow
docstr_tok: ["Test","label","method","returns","CosineWindow"]
code: def test_label(self):
      """Test label method returns CosineWindow"""
      op = qml.CosineWindow(wires=[0, 1])
      assert op.label() == "CosineWindow"
  
file_path: pennylane/tests/templates/test_state_preparations/test_cosine_window.py
imports: import pytest
  import numpy
  import pennylane
  from pennylane.wires import WireError
label_desc: Use image node_id 2 for calling the TestRepresentation obj's underlying member method code with example usage: obj.test_label() without return types