class_docstr: Test ``qml.qjit`` with Catalyst's grad operations
class_docstr_tok: ["Test","``","qml.qjit","``","with","Catalyst","'s","grad","operations"]
docstr: Test the grad transformation with classical preprocessing.
docstr_tok: ["Test","the","grad","transformation","with","classical","preprocessing","."]
code: def test_grad_classical_preprocessing(self):
      """Test the grad transformation with classical preprocessing."""
  
      dev = qml.device("lightning.qubit", wires=1)
  
      @qml.qjit
      def workflow(x):
          @qml.qnode(dev)
          def circuit(x):
              qml.RX(jnp.pi * x, wires=0)
              return qml.expval(qml.PauliY(0))
  
          g = qml.grad(circuit)
          return g(x)
  
      assert jnp.allclose(workflow(2.0), -jnp.pi)
  
imports: from unittest.mock import patch
  import pytest
  import pennylane
  from pennylane.compiler.compiler import CompileError
  from pennylane import numpy
  from jax import numpy
  from jax.core import ShapedArray
label_desc: Use image node_id 1 for calling the TestCatalystGrad obj's underlying member method code with example usage: obj.test_grad_classical_preprocessing() and returns: g, qml