code: def test_output_expand_index_when_index_is_not_pandas_index():
      """
      Test values returned by expand_index when input is not a pandas index.
      """
      index = ["0", "1", "2"]
      expected = pd.RangeIndex(start=0, stop=3, step=1)
      results = expand_index(index, steps=3)
  
      assert (results == expected).all()
  
imports: import pytest
  import numpy
  import pandas
  from skforecast.utils import expand_index
label_desc: Use image node_id 3 for calling a global function with example usage: test_output_expand_index_when_index_is_not_pandas_index() without return types