Tests help you unpack the problem you're coding for, so it's common to spend more time on them than the app code. I generally include tests for each acceptance

Tests help you unpack the problem you're coding for, so it's common to spend more time on them than the app code. I generally include tests for each acceptance criteria of the thing I'm working on, and also tests for "weird bits" -- things I'm afraid someone after me is going to break (myself included). How do you get similar coverage in shorter time? Keep doing it. In a few years it will be second nature, and you'll stop seeing it as a separate activity, but a natural part of feature development.