[codingvelocity]

I think this applies beyond ruby/rails

I've seen the extremes of 100% tdd and 0 tests, and the most efficient projects/applications are the ones that are somewhere in the middle, you don't need tests for every single thing in your application and it becomes harmful to include them at a certain point.

My Personal preference is to focus on testing "critical" things like business logic, utilities,etc. Then have just a few end to end tests that skate the most important flows. In the end you have fairly tested application and you haven't wasted time asserting trivial pieces.