`   One more error: the current page state that's a ``verification and validation`` method. Instead it is a Verification method (it verify the code against the specification). Validation in software engineering and computer programming means to check that the software fit the real need of the users and really work in the context and the environment where it have to operate (this also also things that for any reason are not captured by requirements or expressed in specifications). An unit test definitely is not a Validation method.`