code: def test_return_substring_issue848(self):
      line = shape(json.loads(data_issue_848))
      cut_line = substring(line, 0.7, 0.8, normalized=True)
      assert len(cut_line.coords) == 53
  
imports: import json
  import unittest
  import pytest
  from shapely.errors import GeometryTypeError
  from shapely.geometry import LineString, Point, shape
  from shapely.ops import substring
label_desc: Use image node_id 13 for calling the SubstringTestCase obj's underlying member method code with example usage: obj.test_return_substring_issue848() without return types