Stumbled across ArchUnit today which looks useful. In particular I think there’s power in being able to assert that certain packages really never depend on each other. Although gradle/maven modules would probably be a better level to assert at. It’s depressingly common for code bases to be split into separate modules with the intention that they be a clear separation of concerns only for a web of dependencies to be added because someone wanted to reuse some class and didn’t refactor to a common module.

Of course, it may not be that difficult to write module level tests in Gradle – the dependency structure is already there and easy to work with…