Gene Gotimer just published an article at Techwell Insights discussing how to choose what testing to do in your pipeline and when. Adapting the agile principle of small incremental changes and applying it to rounds of testing, the goal is to do just enough testing at each stage to give you confidence that the next set of tests is worth the investment. That helps keeping your feedback loops quick without ignoring one type of testing until too late.
Read the full article at https://www.techwell.com/techwell-insights/2016/07/just-enough-testing-each-stage-your-delivery-pipeline