code: def test_create_weight_stops(df):
      res = create_weight_stops([1, 2, 3, 4])
      assert res == [[1, 0.0], [2, 0.25], [3, 0.5], [4, 0.75]]
  
imports: import os
  import json
  import numpy
  import pytest
  import pandas
  from pandas.util.testing import assert_frame_equal
  from matplotlib.pyplot import imread
  from mapboxgl.errors import SourceDataError, DateConversionError
  from mapboxgl.utils import df_to_geojson, geojson_to_dict_list, scale_between, create_radius_stops, create_weight_stops, create_numeric_stops, create_color_stops, img_encode, rgb_tuple_from_str, color_map, height_map, numeric_map, convert_date_columns
label_desc: Use image node_id 16 for calling a global function with example usage: test_create_weight_stops(df) without return types