[schmrz]

I think that this is a wrong question to ask. You have probably so many more important questions to answer while working on your MVP.

If you are accustomed to test driven development then you will know (or at least you will be able to reason about it) when to apply it and when not to. It is just another development practice. But I do not think that you will fail if you do TDD or if you do not. But you do risk failing if you emphasize the wrong things such us should we use X or Y development practice. Use whatever works for you and your team (if you are not alone).

To give you a more concrete answer: follow common sense and your team's suggestions. Avoid making a development practice one of your priorities.