code: def test_linestring_empty(self):
      # Test Non-operability of Null geometry
      l_null = LineString()
      assert l_null.wkt == "LINESTRING EMPTY"
      assert l_null.length == 0.0
  
imports: import numpy
  import pytest
  import shapely
  from shapely import LinearRing, LineString, Point
  from shapely.coords import CoordinateSequence
label_desc: Use image node_id 2 for calling the TestLineString obj's underlying member method code with example usage: obj.test_linestring_empty() without return types