the more testing the better? while having tests at unit and integration levels are good...
Test as little as possible/responsible.
I think it was Kent Beck who first articulated that, though it was something many people converged on in the early 2000s in the XP world. Of course it doesn't mean test nothing, it's recognizing tests are liabilities (as all code is) and we need to make sure they are serving a purpose otherwise delete them / refactor them to get rid of duplication of testing and overly verbose long winded tests that keep repeating things over and over again and again, saying the same thing repeatedly, doubling up on testing :)