class_docstr: Tests for integration with the PassthruQNode
docstr: Tests that the Hessian at vanishing state vector amplitudes
  is correct.
code: def test_hessian_at_zero(self, decorator, x, shift):
      """Tests that the Hessian at vanishing state vector amplitudes
      is correct."""
      dev = qml.device("default.mixed", wires=1)
  
      shift = jnp.array(shift)
      x = jnp.array(x)
  
      @qml.qnode(dev, interface="jax", diff_method="backprop")
      def circuit(x):
          qml.RY(shift, wires=0)
          qml.RY(x, wires=0)
          return qml.expval(qml.PauliZ(0))
  
      assert qml.math.isclose(decorator(jax.grad(circuit))(x), 0.0)
      assert qml.math.isclose(
          decorator(jax.jacobian(jax.jacobian(circuit)))(x), -1.0
      )
      assert qml.math.isclose(
          decorator(jax.grad(jax.grad(circuit)))(x), -1.0
      )
  
imports: from functools import partial
  import pytest
  import numpy
  import pennylane
  from pennylane import numpy
  from pennylane.devices.default_mixed import DefaultMixed
label_desc: Use image node_id 11 for calling the TestPassthruIntegration obj's underlying member method code with example usage: obj.test_hessian_at_zero(decorator, x, shift) and returns: qml