I've written a class and many unit test, but I did not make it thread safe. Now, I want to make the class thread safe, but to prove it and use TDD, I want to write some failing unit tests before I start refactoring.
Any good way to do this?
My first thought is just create a couple threads and make them all use the class in an unsafe way. Do this enough times with enough threads and I'm bound to see it break.