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`pytest.raises(Exception)` with no `match=` passes on any error that broad. A TypeError from a refactor, a botched fixture, an import that moved: all of them read as the rejection the test claims to police, so the test goes green for the wrong reason and stays green after the behaviour it guards is gone. PT011 closes that gap for the 317 sites B017 could not reach, because B017 only fires on a single-statement body with no `as e` binding. Each pattern here is the message the code actually raised, recorded by running the sites under a plugin that logged the concrete type and text per call site, so the assertions describe observed behaviour rather than a guess. Where a site raises more than one message across its parametrize cases, the pattern is an alternation of what was seen; where the exception carries an empty `str()` and puts the text on `.message`, the site keeps a narrow `noqa` with the reason. PT014 removes four parametrize cases that were listed twice. The duplicate re-runs an assertion that already passed, and it usually marks a case someone meant to vary and forgot to edit.
36 lines
2.3 KiB
TOML
36 lines
2.3 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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#
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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 = ["F821", "B011", "B015", "B017", "B018", "PT011", "PT012", "PT014", "PT015", "PLR0133", "PLW0127"]
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