docstr: Test if the component correctly handles custom converters.
docstr_tok: ["Test","if","the","component","correctly","handles","custom","converters","."]
code: def test_custom_converter(self, test_files_path):
      """
      Test if the component correctly handles custom converters.
      """
      from pypdf import PdfReader
  
      paths = [test_files_path / "pdf" / "react_paper.pdf"]
  
      class MyCustomConverter:
          def convert(self, reader: PdfReader) -> Document:
              return Document(
                  content="I don't care about converting given pdfs, I always return this"
              )
  
      CONVERTERS_REGISTRY["custom"] = MyCustomConverter()
  
      converter = PyPDFToDocument(converter_name="custom")
      output = converter.run(sources=paths)
      docs = output["documents"]
      assert len(docs) == 1
      assert "ReAct" not in docs[0].content
      assert (
          "I don't care about converting given pdfs, I always return this"
          in docs[0].content
      )
  
file_path: haystack/test/components/converters/test_pypdf_to_document.py
imports: import logging
  from unittest.mock import patch
  import pytest
  from haystack import Document
  from haystack.components.converters.pypdf import PyPDFToDocument, CONVERTERS_REGISTRY
  from haystack.dataclasses import ByteStream
label_desc: Use image node_id 7 for calling the TestPyPDFToDocument obj's underlying member method code with example usage: obj.test_custom_converter(test_files_path) and returns: Document