docstr: Test that a transform can be applied to a quantum function
docstr_tok: ["Test","that","a","transform","can","be","applied","to","a","quantum","function"]
code: def test_single_operator_qfunc(self):
      """Test that a transform can be applied to a quantum function"""
  
      @qml.op_transform
      def my_transform(op, lower=False):
          return op.name.lower() if lower else op.name
  
      res = my_transform(qml.RX, lower=True)(0.5, wires=0)
      assert res == "rx"
  
imports: import pytest
  import pennylane
  from pennylane import numpy
  from pennylane.transforms.op_transforms import OperationTransformError
label_desc: Use image node_id 2 for calling the TestTransformParameters obj's underlying member method code with example usage: obj.test_single_operator_qfunc() and returns: unknown