Hi, is it possible to do fast, non-system wide class subclassing in tests? Currently I would do something like ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ MyTest>>testSomething cls := SomeParent subclass: #Something. "... do some tests ..." cls removeFromSystem ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ This is for example what ClassTest is doing. However this is very slow, and even for small tests suite --- just ten (so far) test methods it takes over ten seconds to test it all, which is quite bad for TDD. My guess is that since it has to write to class to the environment and disk and then remove it it takes a while: ~~~~~~~~~~~~~ [ Object subclass: #Something ] timeToRun. "0:00:00:00.021" [ #Something asClass removeFromSystem ] timeToRun. "0:00:00:00.526" ~~~~~~~~~~~~~ is it possible to speed it up? Create classes that are fast to remove? Thanks, Peter