code: def test_closed_len(self):
      # Len is lazy, it's never computed in this case. TODO?
      self.c.close()
      assert len(self.c) == 0
  
imports: import pytest
  import fiona
  from fiona.model import Geometry
label_desc: Use image node_id 14 for calling the TestReading obj's underlying member method code with example usage: obj.test_closed_len() without return types