[troupo]

You should not be downvoted as heavily as you are now.

I feel like we did testing a disservice by specifying the unit to be too granular. So in most systems you end up with hundreds of useless tests testing very specific parts of code in complete isolation.

In my opinion a unit should be a "full unit of functionality as observed by the user of the system". What most people call integration tests. Instead of testing N similar scenarios for M separate units of code, giving you NxM tests, write N integrations tests that will test those for all of your units of code, and will find bugs where those units, well, integrate.