Unit tests are a waste of time. System level tests are awesome. I am maintaining a very large C++ library used in production by large corporations around the wo

Unit tests are a waste of time. System level tests are awesome. I am maintaining a very large C++ library used in production by large corporations around the world. And I haven’t had a production bug, not even one, for more than 6 years. The reason why is 9000+ system level tests. A combination of 1500+ hand written tests and 7500+ auto generated regression tests.