Hello - I need advice on how to test the DWV system I installed for my basement remodel. I added a drain for a wet bar that I tied into an existing drain stack that the builders roughed in for the basement bathroom. I tied in below the stub out for the bathroom sink in the attached picture. I’m not sure how I can plug the drain where I tied in as there’s no room below the sanitary tee I installed to add a test tee. Any advice would be appreciated.