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61 lines
3.2 KiB
TOML
61 lines
3.2 KiB
TOML
# Lint config for the test tree, which ruff.toml excludes from `ruff check`.
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#
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# Every rule here catches a test that cannot fail. Rules land one at a time, each
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# with its existing violations already fixed, so this list never needs a budget
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# file or a ratchet.
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#
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# F821 a name that does not exist raises NameError, and a test body wrapped in
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# `except Exception: pass` swallows that NameError and reports green
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# B011 `assert False` inside `try:` raises AssertionError, which the `except
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# Exception` below it catches. `pytest.fail` raises BaseException and escapes
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# PT015 same site as B011, from the pytest ruleset
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# B015 a bare `a == b` statement is evaluated and thrown away; the missing `assert`
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# means the test checks nothing
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# B018 a bare attribute access or literal, usually a call missing its parens
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# PLW0127 `x = x` self-assignment, dead code that reads like a narrowing or a fixup
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# PLR0133 comparison of two constants, e.g. `assert True == True`
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# B017 `pytest.raises(Exception)` accepts the TypeError a refactor introduced just as
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# readily as the rejection under test, so a crash reads as a pass. Narrow to the
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# real type, or add `match=` where the code genuinely raises a bare Exception
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# PT012 a `pytest.raises` block that runs on past the raising call. Everything after
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# that call is dead, so an `assert` sitting there is never checked. Keep the
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# block to the call itself and put the assertions below it
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# PT011 `pytest.raises(Exception)` / `(ValueError)` / `(OSError)` with no `match=`. The
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# block passes on any error that broad, so the TypeError a refactor introduced
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# reads as the rejection under test. Pin the message the code actually raises
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# PT014 the same `parametrize` case listed twice. The copy re-runs an assertion that
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# already passed and adds no coverage, and it usually marks a case someone meant
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# to vary and forgot to edit
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# F811 a name bound twice where the first binding was never used. Mostly a repeated
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# import, but the same rule is what catches a second `def test_x` silently
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# replacing the first, and a local that shadows an import the module still calls
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# PT017 an `assert` on the caught error inside `except`. Nothing runs the handler when
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# the call stops raising, so the test goes green on the exact regression it was
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# written to catch. `pytest.raises` fails when the call succeeds
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# RUF043 a `match=` pattern carrying regex metacharacters in a plain string. `match=` is
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# `re.search`, so a `.` copied out of an error message is a wildcard and the block
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# accepts messages the author never meant to accept. Mark a real regex raw, wrap a
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# literal message in `re.escape`, and the pattern says which one it is
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#
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# No target-version here on purpose: it resolves from requires-python (>=3.10), so
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# 3.11-only builtins like BaseExceptionGroup are correctly flagged in a tree that
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# still has to run on 3.10.
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line-length = 120
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lint.select = [
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"F811",
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"F821",
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"B011",
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"B015",
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"B017",
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"B018",
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"PT011",
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"PT012",
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"PT014",
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"PT015",
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"PT017",
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"PLR0133",
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"PLW0127",
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"RUF043",
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]
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