PyPy3.11: Post-test Suite Hang In Fakeredis

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Introduction

Fakeredis is a Redis mock library for Python, designed to provide a reliable and efficient way to test Redis-based applications. However, some users have reported issues with the post-test suite hanging on PyPy3.11. In this article, we will explore the issue and provide a step-by-step guide to reproduce and debug the problem.

Reproducing the Issue

To reproduce the issue, you will need to install a Redis server and run the following commands:

redis-server - <<EOF
port 6390
bind 127.0.0.1
EOF

Then, clone the Fakeredis repository and create a virtual environment using PyPy3.11:

git clone https://github.com/cunla/fakeredis-py/
cd fakeredis-py/
uv venv -p pypy3.11
uv pip install -e . pytest{,-asyncio,-mock}
uv run --no-project pytest test/test_tcp_server/test_connectivity.py

Expected Output

The expected output should be a test report indicating that the test has passed. However, in this case, the test suite will hang indefinitely.

Actual Output

The actual output will be a test report indicating that the test has passed, followed by a warning message about an unknown config option. If you interrupt the test using Ctrl+C, you will see an exception ignored in the threading module.

========================================================= test session starts =========================================================
platform linux -- Python 3.11.11[pypy-7.3.19-final], pytest-8.3.5, pluggy-1.5.0
rootdir: /tmp/fakeredis-py
configfile: pyproject.toml
plugins: mock-3.14.0, asyncio-0.25.3
asyncio: mode=Mode.STRICT, asyncio_default_fixture_loop_scope=function
collected 1 item                                                                                                                      

test/test_tcp_server/test_connectivity.py .                                                                                     [100%]

========================================================== warnings summary ===========================================================
.venv/lib/pypy3.11/site-packages/_pytest/config/__init__.py:1441
  /tmp/fakeredis-py/.venv/lib/pypy3.11/site-packages/_pytest/config/__init__.py:1441: PytestConfigWarning: Unknown config option: generate_report_on_test
  
    self._warn_or_fail_if_strict(f"Unknown config option: {key}\n")

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
==================================================== 1 passed, 1 warning in 0.64s =====================================================

Debugging the Issue

The issue is specific to PyPy3.11 and does not occur on PyPy3.10 or CPython 3.10/3.11. To debug the issue, you can try the following steps:

  1. Check the Redis server: Ensure that the Redis server is running and listening on the correct port.
  2. Verify the Fakeredis configuration: Check the Fakeredis configuration file to ensure that it is correctly set up.
  3. Run the test in debug mode: Run the test in debug mode to get more detailed information about the issue.
  4. Check for threading issues: The exception ignored in the threading module suggests that there may be a threading issue. Check the Fakeredis code to ensure that it is properly handling threading.

Conclusion

The post-test suite hang in Fakeredis on PyPy3.11 is a complex issue that requires careful debugging and analysis. By following the steps outlined in this article, you should be able to reproduce and debug the issue. If you are still experiencing problems, please provide more information about your environment and configuration, and we will do our best to assist you.

Additional Resources

Related Issues

Q: What is Fakeredis?

A: Fakeredis is a Redis mock library for Python, designed to provide a reliable and efficient way to test Redis-based applications.

Q: What is the issue with PyPy3.11?

A: The post-test suite hangs indefinitely on PyPy3.11, causing the test to fail.

Q: How do I reproduce the issue?

A: To reproduce the issue, you will need to install a Redis server and run the following commands:

redis-server - <<EOF
port 6390
bind 127.0.0.1
EOF

Then, clone the Fakeredis repository and create a virtual environment using PyPy3.11:

git clone https://github.com/cunla/fakeredis-py/
cd fakeredis-py/
uv venv -p pypy3.11
uv pip install -e . pytest{,-asyncio,-mock}
uv run --no-project pytest test/test_tcp_server/test_connectivity.py

Q: What is the expected output?

A: The expected output should be a test report indicating that the test has passed.

Q: What is the actual output?

A: The actual output will be a test report indicating that the test has passed, followed by a warning message about an unknown config option. If you interrupt the test using Ctrl+C, you will see an exception ignored in the threading module.

Q: How do I debug the issue?

A: To debug the issue, you can try the following steps:

  1. Check the Redis server: Ensure that the Redis server is running and listening on the correct port.
  2. Verify the Fakeredis configuration: Check the Fakeredis configuration file to ensure that it is correctly set up.
  3. Run the test in debug mode: Run the test in debug mode to get more detailed information about the issue.
  4. Check for threading issues: The exception ignored in the threading module suggests that there may be a threading issue. Check the Fakeredis code to ensure that it is properly handling threading.

Q: Is this issue specific to PyPy3.11?

A: Yes, this issue is specific to PyPy3.11 and does not occur on PyPy3.10 or CPython 3.10/3.11.

Q: Where can I find more information about Fakeredis?

A: You can find more information about Fakeredis on the official documentation page: https://fakeredis.readthedocs.io/

Q: Where can I report issues with Fakeredis?

A: You can report issues with Fakeredis on the official GitHub page: https://github.com/cunla/fakeredis-py/issues

Q: Can I get help with debugging the issue?

A: Yes, you can get help with debugging the issue by posting a question on the Fakeredis GitHub page or by reaching out to the Fakeredis community on the official Discord channel.