code: def test_make_plots(mock_plt: tp.Any) -> None:
      func = core.PowerSystem()
      func.losses = [0.1]
      func.make_plots("not_valid.png")
      assert mock_plt.clf.call_count == 1
      assert mock_plt.subplot.call_count == 4
      assert mock_plt.savefig.call_count == 1
  
imports: import typing
  from unittest.mock import patch
  import numpy
  from .None import core
label_desc: Use image node_id 2 for calling a global function with example usage: test_make_plots(mock_plt) without return types