bors e68fcb0973 Auto merge of #12725 - llogiq:allow-useless-test-vecs, r=blyxyas
configurably allow `useless_vec` in tests

This adds a `àllow-useless-vec-in-test` configuration which, when set to `true` will allow the `useless_vec` lint in `#[test]` functions and code within `#[cfg(test)]`. It also moves a `is_in_test` helper to `clippy_utils`.

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changelog: configurably allow [`useless_vec`] in test code
2024-04-28 20:10:33 +00:00
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