A test environment is provided : https://wikidata-termstore.wmflabs.org/index.php/Main_Page To access to its database, you need to get the access granted. Feel free to add a comment to this ticket if you need it.

The state of that env. will mimic a production state in which:

• tools will have to read property terms from new schema (as explained in June 26th checkpoint in T221765)
  
  All properties on test node are migrated into the new schema now. A tool can test reading from new now.

• tools will have to read item terms from one of the two schemas (as explained in July 10th checkpoint in T221765)
  
  Items Q1 to Q100000 are now migrated into new schema, Items from Q100001 until Q999999 will stay in old wb_terms. Tools can now test reading from new schema for items below Q100001 and from old otherwise.