Checked other resources

• This is a bug, not a usage question.
• I added a clear and descriptive title that summarizes this issue.
• I used the GitHub search to find a similar question and didn't find it.
• I am sure that this is a bug in LangChain rather than my code.
• The bug is not resolved by updating to the latest stable version of LangChain (or the specific integration package).
• This is not related to the langchain-community package.
• I posted a self-contained, minimal, reproducible example. A maintainer can copy it and run it AS IS.

Package (Required)

• langchain
• langchain-openai
• langchain-anthropic
• langchain-classic
• langchain-core
• langchain-cli
• langchain-model-profiles
• langchain-tests
• langchain-text-splitters
• langchain-chroma
• langchain-deepseek
• langchain-exa
• langchain-fireworks
• langchain-groq
• langchain-huggingface
• langchain-mistralai
• langchain-nomic
• langchain-ollama
• langchain-perplexity
• langchain-prompty
• langchain-qdrant
• langchain-xai
• Other / not sure / general

Example Code (Python)

Run pytest without the `--only_extended` flag set and it dies with a `ValueError`

Error Message and Stack Trace (if applicable)

> INTERNALERROR>   File "/build/source/libs/langchain/tests/unit_tests/conftest.py", line 85, in pytest_collection_modifyitems
> INTERNALERROR>     only_extended = config.getoption("--only-extended") or False
> INTERNALERROR>                     ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
> INTERNALERROR>   File "/nix/store/gx29m36wxs6vz4qk45m7n5pylpgj690y-python3.13-pytest-8.4.2/lib/python3.13/site-packages/_pytest/config/__init__.py", line 1754, in getoption
> INTERNALERROR>     raise ValueError(f"no option named {name!r}") from e
> INTERNALERROR> ValueError: no option named 'only_extended'

Description

• config.getoption("--only-extended") isn't returning Null when the flag is missing, it's throwing ValueError
• config.getoption accepts a default parameter, see https://docs.pytest.org/en/stable/reference/reference.html#pytest.Config.getoption
• Fix: Replace config.getoption("--only-extended") or False with config.getoption("--only-extended", default=False)

System Info

n/a