What features should we build? What's the feature set for our MVP? There are a lot of questions we need to answer before we write a single line of code.
This isn't about testing a hypothesis, this is about generating ideas. I've mentioned the difference between Generative and Evaluative in lean startup before.
If we know our goal is to generate ideas, there a variety of methods you can use in the Unofficial Startup Real Book. One of my favorites was told to me by Sean K. Murphy and covered in his post on pretotyping: Picnic in the Graveyard