I worked on 100 of projects and my answer is by lowering the repeat cycle, which is done by test driven development "rspec" or other testing tools. The more det

I worked on 100 of projects and my answer is by lowering the repeat cycle, which is done by test driven development "rspec" or other testing tools. The more detailed test the better but not too detailed. Also don't re-invent the wheel, use library that already exist, maintained and has community support.