code: def test_slice(self):
      with pytest.warns(FionaDeprecationWarning):
          features = self.c[2:5]
          assert len(features) == 3
  
file_path: Fiona/tests/test_non_counting_layer.py
imports: import unittest
  import pytest
  import fiona
  from fiona.errors import FionaDeprecationWarning
label_desc: Use image node_id 7 for calling the TestNonCountingLayer obj's underlying member method code with example usage: obj.test_slice() without return types