It depends on what you want to test. Atm, testing an idea is easier than ever before, but shipping an MVP gets harder every day. To test the underlying idea we asked contractors to fill in prices in Google sheets. After that we have spent 2 years building our MVP. People expect you to be as useful, adaptive and intuitive as unicorns from the very start. (Looking back, we could have ship it faster, but as always you know which edges should have been cut post factum) Imho.