code: def test_update():
      # Test update with multiple unique keys
      SAMPLE_DOCS = [
          {"id": u("test1"), "path": u("/test/1"), "text": u("Hello")},
          {"id": u("test2"), "path": u("/test/2"), "text": u("There")},
          {"id": u("test3"), "path": u("/test/3"), "text": u("Reader")},
      ]
  
      schema = fields.Schema(
          id=fields.ID(unique=True, stored=True),
          path=fields.ID(unique=True, stored=True),
          text=fields.TEXT,
      )
  
      with TempIndex(schema, "update") as ix:
          with ix.writer() as w:
              for doc in SAMPLE_DOCS:
                  w.add_document(**doc)
  
          with ix.writer() as w:
              w.update_document(
                  id=u("test2"), path=u("test/1"), text=u("Replacement")
              )
  
imports: from __future__ import with_statement
  import random
  from collections import defaultdict
  from datetime import datetime
  import pytest
  from whoosh import analysis, fields, index, qparser, query, __version__
  from whoosh.compat import b, u, xrange, text_type, permutations
  from whoosh.filedb.filestore import RamStorage
  from whoosh.writing import IndexingError
  from whoosh.util.numeric import length_to_byte, byte_to_length
  from whoosh.util.testing import TempIndex, TempStorage
label_desc: Use image node_id 14 for calling a global function with example usage: test_update() without return types