What to test in Rails in controller/view/request/feature tests respectively? A best practice?

[sublimecoder (Jared Smith)]

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When do you drop down a layer in TDD?

I’m wondering when you drop down and write a controller spec, or a model spec. Do you let the integration tests drive this entirely, and let the error messages from the integration tests drag you through or do you write specs for each section of code individually? So you start with a integration test, and then move to a route spec, then a controller spec, then a view spec, the a model spec. After following the exercises it seemed like there was close to 100% coverage and at all of those types.…