code: def test_len_closed_len(self):
      # Lazy len is computed in this case and sticks.
      len(self.c)
      self.c.close()
      assert len(self.c) == 67
  
imports: import pytest
  import fiona
  from fiona.model import Geometry
label_desc: Use image node_id 15 for calling the TestReading obj's underlying member method code with example usage: obj.test_len_closed_len() without return types