As previously mentioned on e.g. osm.org/changeset/33406535 , please don’t use the main OSM server for test edits. If you want to test things in the editor, there’s a test server available at http://api06.dev.openstreetmap.org (it needs a separate login from the main OSM site but is otherwise similar)

You can add any amount of test data you like there without it causing any problems on the live map.

Cheers, Andy