code: def test_error_missing_frequency_info():
      """Test that an error is raised if neither nums_frequency nor spectra is given."""
  
      opt = RotosolveOptimizer()
      fun = lambda x: x
      x = np.array(0.5, requires_grad=True)
  
      with pytest.raises(
          ValueError, match="Neither the number of frequencies nor the"
      ):
          opt.step(fun, x)
  
imports: import functools
  import pytest
  from scipy.optimize import shgo
  import pennylane
  from pennylane import numpy
  from pennylane.utils import _flatten, unflatten
  from pennylane.optimize import RotosolveOptimizer
label_desc: Use image node_id 3 for calling a global function with example usage: test_error_missing_frequency_info() without return types