code: def test_jax(self, v):
      import jax
  
      def circuit(theta):
          qml.RX(theta, wires=0)
          qml.PauliZ(wires=0)
          qml.CNOT(wires=[0, 1])
  
      def loss(theta):
          U = qml.matrix(circuit)(theta)
          return qml.math.real(qml.math.trace(U))
  
      x = jax.numpy.array(v)
  
      l = loss(x)
      dl = jax.grad(loss)(x)
      matrix = qml.matrix(circuit)(x)
  
      assert isinstance(matrix, jax.numpy.ndarray)
      assert np.allclose(l, 2 * np.cos(v / 2))
      assert np.allclose(dl, -np.sin(v / 2))
  
imports: from functools import reduce, partial
  from warnings import catch_warnings
  import pytest
  from gate_data import I, X, Y, Z, H, S, CNOT, Rotx, Roty
  import pennylane
  from pennylane import numpy
  from pennylane.transforms.op_transforms import OperationTransformError
label_desc: Use image node_id 1 for calling the TestDifferentiation obj's underlying member method code with example usage: obj.test_jax(v) and returns: qml