My opinion is, _my unit tests_ are to protect my code against unwanted changes. To that end, unit tests test a single unit. And everything is mocked. If I have to rewrite a method, usually I rewrite all of its unit tests. Which is fine. They’re easy to write or rewrite.
Fully mocked unit tests are then supplemented with fewer “full stack” tests higher up the pyramid.
My opinion is, _my unit tests_ are to protect my code against unwanted changes. To that end, unit tests test a single unit. And everything is mocked. If I have to rewrite a method, usually I rewrite all of its unit tests. Which is fine. They’re easy to write or rewrite.
Fully mocked unit tests are then supplemented with fewer “full stack” tests higher up the pyramid.