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This is a question I asked myself in the past: Does _snaps folder need some cleaning when you change the snapshot expectation ?
This topic arises mainly when using variant argument and the value change because of refactoring for example. The folder for snapshot will change and so what is needed in the process as those files are followed on git ?
It seems testthat will take care of that and a local devtools::test() should remove what is unused.
If that is all that would be interesting to mention. If there are some edge case, it could be good too.