DEV: Enable PyPy testing again

.github/workflows/github-ci.yaml

@@ -131,7 +131,7 @@ jobs:
     runs-on: ubuntu-24.04
     strategy:
       matrix:
-        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13', '3.14']  # , 'pypy3.11']
+        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13', '3.14', 'pypy3.11']
         use-crypto-lib: ['cryptography']
         include:
           - python-version: '3.9'
@@ -183,6 +183,7 @@ jobs:
         allow-prereleases: true
         cache: 'pip'
         cache-dependency-path: '**/requirements/ci-3.11.txt'
+        check-latest: ${{ startsWith(matrix.python-version, 'pypy') }}
     - name: Upgrade pip
       run: |
         python -m pip install --upgrade pip

tests/test_workflows.py

@@ -5,6 +5,8 @@
 """
 
 import binascii
+import platform
+import sys
 from io import BytesIO
 from pathlib import Path
 from re import findall
@@ -14,6 +16,7 @@
 from PIL import __version__ as pil_version
 
 from pypdf import PdfReader, PdfWriter, Transformation
+from pypdf._utils import Version
 from pypdf.constants import PageAttributes as PG
 from pypdf.errors import PdfReadError, PdfReadWarning
 from pypdf.generic import (
@@ -955,7 +958,24 @@ def test_fields_returning_stream():
     assert "BtchIssQATit_time" in reader.get_form_text_fields()["TimeStampData"]
 
 
-def test_replace_image(tmp_path):
+def test_replace_image(tmp_path, monkeypatch):
+    from PIL import PdfParser  # noqa: PLC0415
+
+    def pdf_parser_close_buf(pdf_parser: PdfParser.PdfParser) -> None:
+        if isinstance(pdf_parser.buf, memoryview):
+            pdf_parser.buf.release()
+        elif isinstance(pdf_parser.buf, PdfParser.mmap.mmap):
+            pdf_parser.buf.close()
+        pdf_parser.buf = None
+
+    if (
+            Version(pil_version) < Version("12.3.0") and
+            platform.python_implementation() == "PyPy" and
+            sys.pypy_version_info[:3] >= (7, 3, 22)
+    ):
+        # Regression since PyPy 7.3.22.
+        monkeypatch.setattr(PdfParser.PdfParser, "close_buf", pdf_parser_close_buf)
+
     writer = PdfWriter(clone_from=RESOURCE_ROOT / "labeled-edges-center-image.pdf")
     reader = PdfReader(RESOURCE_ROOT / "jpeg.pdf")
     img = reader.pages[0].images[0].image