code: def test_standard_validity():
      """Check the operation using the assert_valid function."""
  
      state = np.array([1, 2j, 3, 4j, 5, 6j, 7, 8j])
      state = state / np.linalg.norm(state)
  
      op = qml.MottonenStatePreparation(
          state_vector=state, wires=range(3)
      )
  
      qml.ops.functions.assert_valid(op)
  
imports: import pytest
  import numpy
  import pennylane
  from pennylane import numpy
  from pennylane.templates.state_preparations.mottonen import gray_code, _get_alpha_y
label_desc: Use image node_id 1 for calling a global function with example usage: test_standard_validity() without return types