I've realised that splitting and amending commits is exactly like refactoring. You have the same goals: clear, well-defined units.
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Test code is total: we require it to always terminate or it's a failure! It also typically has 100% line and branch coverage.
I feel way less nervous about refactoring tests, you can always just run them.
It feels like rename is by far the most important refactoring operation. If I had an IDE with only one refactoring, I think I'd want rename.
... and my third refactoring with Cursor changed some function calls that I didn't want it to modify. Subtle.
I've had the most success with AI coding tools when I know exactly what I want the output to look like.