Generally, my impression is that “testing locally” isn’t really feasible or usually done with OpenStreetMap these days. Exceptions could include big data users, but for individual editors, the usual way I’ve assumed is to try to get it as decent as possible, upload, then see how it works in the tools once they index in your change, and make adjustments if necessary. It’s a very iterative-improvement process, but I feel that works with the ethos of OSM in general.
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