code: def test_should_keep_missing_document_current_answer(
      self,
      mock_reader: ExtractiveReader,
      doc1: Document,
      candidate_answer: ExtractedAnswer,
  ):
      answer2 = "river in Maine"
      keep = mock_reader._should_keep(
          candidate_answer=candidate_answer,
          current_answers=[
              ExtractedAnswer(
                  query="test",
                  data=answer2,
                  document=None,
                  document_offset=ExtractedAnswer.Span(
                      doc1.content.find(answer2),
                      doc1.content.find(answer2) + len(answer2),
                  ),
                  score=0.1,
                  meta={},
              )
          ],
          overlap_threshold=0.01,
      )
      assert keep is True
  
imports: from math import ceil, exp
  from typing import List
  from unittest.mock import patch, Mock
  import pytest
  import torch
  from transformers import pipeline
  from haystack.components.readers import ExtractiveReader
  from haystack import Document, ExtractedAnswer
label_desc: Use image node_id 7 for calling the TestDeduplication obj's underlying member method code with example usage: obj.test_should_keep_missing_document_current_answer(mock_reader, doc1, candidate_answer) without return types