code: def test_extra_slice():
      schema = fields.Schema(key=fields.ID(stored=True))
      ix = RamStorage().create_index(schema)
      w = ix.writer()
      for char in u("abcdefghijklmnopqrstuvwxyz"):
          w.add_document(key=char)
      w.commit()
  
      with ix.searcher() as s:
          r = s.search(query.Every(), limit=5)
          assert r[6:7] == []
  
imports: from __future__ import with_statement
  import pytest
  from whoosh import analysis, fields, formats, highlight, qparser, query
  from whoosh.codec.whoosh3 import W3Codec
  from whoosh.compat import u, xrange, text_type, permutations
  from whoosh.filedb.filestore import RamStorage
  from whoosh.util.testing import TempStorage, TempIndex
label_desc: Use image node_id 11 for calling a global function with example usage: test_extra_slice() without return types