I have a tendency to overcomplicate things sometimes. Unit tests, are one such piece of code, that you want to keep as simple and clean as possible, so that other developers can easily find out how your class-or-method-under-test is supposed to work. There’s a principle for that that says it very strongly – “Keep it simple, stupid.” Don’t make it flexible when it does not have to be (just … hard code it). For example, when I was working on IInterceptorSelector support for Castle DynamicProxy, I had to test proxies without target, where return value is set by an...