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.

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())