I'm the author of an open source tool to extract metrics reports from Jira. It used to be that I could test against the Cloud API and reasonably expect that my code would also work on Data Center (and Server). That's no longer true with the recent changes to the search API. Cloud now only supports v3 and Data Centre only supports v2, which means I have different code for each.
Is there a test instance of Data Center that I can run my code against? How are others handling this?