new_contents: from utilities.simulation_utilities import check_inputs
  
  import pytest
  import numpy as np
  
  
  @pytest.mark.parametrize("input,expected", [
      (None, np.ndarray([0])),
      ([0], np.array([0])),
      (1, np.array([1])),
      (range(5), np.array([0,1,2,3,4]))
  ])
  def test_check_inputs(input, expected):
      assert np.allclose(check_inputs(input), expected)
subject: Add a test for check_inputs.