Implementing a feature in a two week timebox is easy enough: Reduce scope to a few small changes. The real problem comes when we try to compress testing from months to a day or two.
It is possible, but it will take a lot more than stories, sprints, and standups. The whole team will need to work together, to figure out what to build before we build it, to check for and ensure quality is high at every step, instead of letting uncertainty rise and conducting a mass inspection at the end. Learn to put down old tools, like test cases, test plans, and test strategy documents, along with what to pick up in their place - Exploration, Specification by Example, Unit tests, Build and Deploy automation.
Matt Heusser describes this new way of thinking about testing, how it changes the way we work, and where to go to keep going.