[jon-wood]

For my use case (building a reasonably complicated e-commerce platform) I find that the sweet spot tends to be integration testing to make sure the frontend is spitting out the right thing when going through the whole stack, and unit testing to make sure the correct logic is being applied when performing particular operations.

That combination allows reasonably fast unit testing, because database interaction is stubbed out for that level, which gives a decent level of confidence that nothing major has been broken within a few seconds, and then a longer 10-15 minute integration test suite which checks the stack works as a whole.