My team and I use TDD as a main development technique for making our games. This is incredibly important to us and since we're only starting out we found that the Unity test runner is an amazing tool for this!
But as our tests grow in size we've come across random tests failing for seemingly no reason. We believe the issue lies in the fact the tests probably don't reset stats at the beginning and end of each test. That isn't the issue I want to present here.
Since tests need to be able to run successfully independently and while running with other tests an option to run the tests in shuffle mode would help greatly. What I mean by this is that the test runner does run all tests but shuffles the order of them, so they don't always go alphabetically. Shuffling through test files and individual tests would help greatly!
This is a very small change that could help immensely in the long run for any developer that is using TDD. I hope to see this feature in a Unity update :)