def bba_self_test():
    """
  This is the non-regression test of bell_bagel_assembly.
  Look at the Tk window to check errors.
  """
    r_tests = [['simplest test', ''], ['no axle_holes', '--axle_hole_nb 0'],
        ['odd number of axle_holes', '--axle_hole_nb 5'], ['outputfile',
        '--output_file_basename test_output/bba_self_test.dxf'], [
        'last test',
        '--bagel_axle_internal_diameter 25.0 --bagel_axle_external_diameter 40.0 --axle_hole_position_diameter 35.0 --axle_internal_diameter 28.0 --axle_external_diameter 42.0'
        ]]
    return r_tests
