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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"agent: when writing skipif for tests that pin a Python version inside uv_init_dir, check both uv availability AND current Python version","articleBody":"## What happened\n\nA test that calls `uv python pin 3.13` inside a `uv_init_dir`-based fixture was guarded with only `not is_uv_python_available(\"3.13\")`. On the Python 3.14 macOS CI runner, Python 3.13 was installed in uv so the skip did not fire — but the test still failed because the fixture created a project with `requires-python = \"\u003e=3.14\"`, which blocks `uv python pin 3.13`.\n\n## Root cause\n\nPinning a specific Python version X inside a `uv_init_dir` project has two independent failure modes:\n1. Python X is not installed in uv (caught by `is_uv_python_available(X)`).\n2. The current Python is newer than X — the fixture creates a project with `requires-python = \"\u003e=\u003ccurrent\u003e\"`, so `uv python pin X` is rejected by uv.\n\nThe skip condition only covered failure mode 1. Failure mode 2 was introduced silently by an earlier fix that changed the fixture to use the current Python version.\n\n## Generalised principle\n\nWhen writing a `skipif` for a test that pins a specific Python version X inside a `uv_init_dir`-based fixture, the condition must cover both failure modes:\n\n```python\n@pytest.mark.skipif(\n    not is_uv_python_available(\"X.Y\") or sys.version_info \u003e (X, Y),\n    reason=\"Requires Python X.Y in uv and current Python \u003c= X.Y (otherwise requires-python blocks the pin)\",\n)\n```\n\nThe test can only run when: (a) version X is installed in uv AND (b) the current Python is ≤ X.\n\n## Resolution\n\nAdded `or sys.version_info \u003e (3, 13)` to the `skipif` condition on `test_file_doesnt_exist` in `test_sonarqube_config.py` and added `import sys` to that file.\n\n## Follow-up\n\nConsider whether other tests using `uv_python_pin` inside `uv_init_dir` have the same incomplete skip condition.","author":{"url":"https://github.com/nathanjmcdougall","@type":"Person","name":"nathanjmcdougall"},"datePublished":"2026-04-07T18:59:07.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/1872/usethis-python/issues/1872"}