Perhaps you could try TestItemRunner.jl (Prerelease of new testing framework and test run UI in VS Code). This will let you isolate your unit tests and integrate with VS code’s built in Test viewer. From there you can run individual tests. There is also usually an option to debug an individual test, but the framework is still in beta so I’m not 100% sure that feature is there. However, the runner lets you launch a specific unit test from the REPL and you can just use the standard @enter or @run (the former seems to be more reliable for me) to enter debugging mode.