Conclusion

Properly testing a complex system is a difficult task that requires intelligence and creativity in choosing strategies and termination criteria. This is made easier when the person in charge of testing has a good understanding of the actual context of use.

It is also a task that presents pitfalls: believing that it is simpler and easier than design, which is considered more noble; believing that the more defects the test finds, the better it is; etc.

A good testing strategy can strengthen the relationship of trust between customer and supplier and reduce revalidation costs on the customer side. In short, testing a complex system is not about checking everything, but about having confidence in its robustness and behavior in critical contexts. Testing should be viewed as an activity of exploration, simulation, and continuous validation, rather...