class_docstr: Test the transform function (validate and dispatch).
docstr: Test a device transform.
code: def test_device_transform(self, valid_transform):
      """Test a device transform."""
      dispatched_transform = transform(valid_transform)
      new_dev = dispatched_transform(dev, index=0)
  
      assert new_dev.original_device is dev
      assert repr(new_dev).startswith("Transformed Device")
  
      program, _ = dev.preprocess()
      new_program, _ = new_dev.preprocess()
  
      assert isinstance(program, qml.transforms.core.TransformProgram)
      assert isinstance(
          new_program, qml.transforms.core.TransformProgram
      )
  
      assert len(program) == 5
      assert len(new_program) == 6
  
      assert new_program[-1].transform is valid_transform
  
      @qml.qnode(new_dev)
      def circuit():
          qml.PauliX(0)
          return qml.state()
  
      circuit()
  
imports: from typing import Sequence, Callable
  from functools import partial
  import pytest
  import pennylane
  from pennylane.transforms.core import transform, TransformError, TransformContainer
label_desc: Use image node_id 18 for calling the TestTransformDispatcher obj's underlying member method code with example usage: obj.test_device_transform(valid_transform) and returns: qml