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 unittest
  import re
  import pytest
  import fiona
  from .conftest import WGS84PATTERN
label_desc: Use image node_id 12 for calling the ReadingTest obj's underlying member method code with example usage: obj.test_closed_len() without return types