The problem you may be facing is not that the testing frameworks are inadequate. Usually, what you encounter is inappropriately designed classes. Even though your classes may behave correctly and may look correct unless they allow for testing, they are not designed correctly.
However, this is good news. It means that you can repair the problem before it's inconvenient to do so. The class design will probably haunt you later on when you start building a class hierarchy based on it. Fixing the design during test implementation will simply reduce the possible technological debt.
