Namespacing identifiers in general is a great idea for handling those class of integration tests which cannot be fully isolated. It makes it easy to write all kinds of garbage from even concurrently running tests all without any of them colliding or accidentally reading each others writes (because they are themselves namespace aware!). It's low effort to get all the pieces of your system to play along (often entirely transparent via DI), but gives a huge power to weight ratio. Basically deletes an entire class of problems which usually plague large, mature test suits