Before talking about testing and certification we need to discuss the Requirement Engineering. The hour of truth comes at the latest in the moment of the overall system testing: is this what was expected? It would be nice to have a tool that provides the answer to this question. There are undoubtedly promising approaches and methods, but all of them have their limits.
That is why we do not sell tools, but we find solutions tailored to your questions. It is not predetermined what this solution will be: a tool, a process, customized software, or a mixture of everything. But it will definitely be the solution you are looking for.