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## Summary This PR implements a diff test helper `assert_diagnostics_diff` as described in #19351. The diff file includes both the settings ( e.g. `+linter.preview = enabled`) and the snapshot data itself. The current implementation looks for each old diagnostic in the new snapshot. This works when the preview behavior adds/removes a couple diagnostics. This implementation does not work well when every diagnostic is modified (e.g. a "fix" is added). https://github.com/astral-sh/ruff/pull/19715#discussion_r2259410763 has ideas for future improvements to this implementation. The example usage in this PR writes the diff to `preview_diff` file instead of `preview` file, which might be a useful convention to keep. ## Test Plan - Included a unit test at: https://github.com/astral-sh/ruff/pull/19715/files#diff-d49487fe3e8a8585529f62c2df2a2b0a4c44267a1f93d1e859dff1d9f8771d36R523 - Example usage of this new test helper: https://github.com/astral-sh/ruff/pull/19715/files#diff-2a33ac11146d1794c01a29549a6041d3af6fb6f9b423a31ade12a88d1951b0c2R1 |
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