Clean up tests for pdf parsers (#4595)

# Organize tests for pdf parsers

Clean up tests for pdf parsers, remove duplicate tests, convert to unit
tests.

langchain/document_loaders/parsers/pdf.py

@@ -93,12 +93,20 @@ class PyPDFium2Parser(BaseBlobParser):
         """Lazily parse the blob."""
         import pypdfium2
 
-        with blob.as_bytes_io() as f:
-            pdf_reader = pypdfium2.PdfDocument(f)
-            for page_number, page in enumerate(pdf_reader):
-                content = page.get_textpage().get_text_range()
-                metadata = {"source": blob.source, "page": page_number}
-                yield Document(page_content=content, metadata=metadata)
+        # pypdfium2 is really finicky with respect to closing things,
+        # if done incorrectly creates seg faults.
+        with blob.as_bytes_io() as file_path:
+            pdf_reader = pypdfium2.PdfDocument(file_path, autoclose=True)
+            try:
+                for page_number, page in enumerate(pdf_reader):
+                    text_page = page.get_textpage()
+                    content = text_page.get_text_range()
+                    text_page.close()
+                    page.close()
+                    metadata = {"source": blob.source, "page": page_number}
+                    yield Document(page_content=content, metadata=metadata)
+            finally:
+                pdf_reader.close()
 
 
 class PDFPlumberParser(BaseBlobParser):

pyproject.toml

@@ -83,6 +83,8 @@ docarray = {version="^0.31.0", optional=true}
 protobuf = {version="3.19", optional=true}
 hnswlib = {version="^0.7.0", optional=true}
 lxml = {version = "^4.9.2", optional = true}
+pymupdf = {version = "^1.22.3", optional = true}
+pypdfium2 = {version = "^4.10.0", optional = true}
 
 
 [tool.poetry.group.docs.dependencies]
@@ -177,6 +179,8 @@ extended_testing = [
  "jq",
  "pdfminer.six",
  "pypdf",
+ "pymupdf",
+ "pypdfium2",
  "tqdm",
  "lxml",
 ]

tests/unit_tests/document_loader/parsers/test_pdf_parsers.py

@@ -7,6 +7,8 @@ from langchain.document_loaders.base import BaseBlobParser
 from langchain.document_loaders.blob_loaders import Blob
 from langchain.document_loaders.parsers.pdf import (
     PDFMinerParser,
+    PyMuPDFParser,
+    PyPDFium2Parser,
     PyPDFParser,
 )
 from tests.data import HELLO_PDF, LAYOUT_PARSER_PAPER_PDF
@@ -62,3 +64,16 @@ def test_pdfminer_parser() -> None:
     """Test PDFMiner parser."""
     # Does not follow defaults to split by page.
     _assert_with_parser(PDFMinerParser(), splits_by_page=False)
+
+
+@pytest.mark.requires("fitz")  # package is PyMuPDF
+def test_pymupdf_loader() -> None:
+    """Test PyMuPDF loader."""
+    _assert_with_parser(PyMuPDFParser())
+
+
+@pytest.mark.requires("pypdfium2")
+def test_pypdfium2_parser() -> None:
+    """Test PyPDFium2 parser."""
+    # Does not follow defaults to split by page.
+    _assert_with_parser(PyPDFium2Parser())