> In the worst case, N tests will need N mocks and it will be the same as before. This very much neglects the probably significant overhead of writing, maintai

> In the worst case, N tests will need N mocks and it will be the same as before. This very much neglects the probably significant overhead of writing, maintaining, understanding the M mocks on top of the base of N tests, but since, as you said, this is "at Google scale" the trade-off seemingly becomes worthwhile