#16857 introduced a bunch of tests of the new versioning functionality, which is great. Unfortunately, the tests aren't hermetic - they're accessing the real file system and spawning processes against the real OS. That makes them subject to significantly more flakiness.

We should move these to be hermetic (using the mock process manager and memory file system, etc.). For example, the other tests in xcodeproj_test.dart use testUsingOsxContext(), which sets up all the hermetic bindings: