code: def test_panel_n_inputs():
      """Tests that error is raised if n_inputs not 1 or 2."""
      with pytest.raises(
          ValueError, match="Panel plot function accepts input"
      ):
          panel(coeffs_1D_valid_list, 3, ax_panel_1d_valid)
  
file_path: pennylane/tests/fourier/test_visualize.py
imports: import pytest
  from pennylane import numpy
  from pennylane.fourier.visualize import _validate_coefficients
  from pennylane.fourier.visualize import violin, bar, box, panel, radial_box
label_desc: Use image node_id 1 for calling a global function with example usage: test_panel_n_inputs() without return types