|There's more than one way to do things
I guess I'm not communicating my point clearly. I don't see any point in writing tests for a first draft of a spec implementation/POC. No client is going to communicate their requirements in a manner that's not going to require iteration on both ends unless they're coming to you saying "we need to integrate with this API" which is an existing specification that has known inputs and outputs regardless of the quality of the API. POC and demos have only as good of a chance of being correct as the requirements dictating their implementation and the quality of communication to do so.
Starting with demos, POCs and tests for the main features should minimize that risk.
I'm not sure how tests minimize risk in a POC unless you're using them as something that's black and white in terms of an API contract that says "hey these are the requirements that were communicated and this is proof that they were coded to spec." I feel like it's much harder to iterate into a concrete state quickly if you have to change tests 2-3 times before you and your client reach a consensus.
Anyway I'm probably not going to get my point across any more effectively at this point so hopefully someone finds some sort of value reading through this.
Three thousand years of beautiful tradition, from Moses to Sandy Koufax, you're god damn right I'm living in the fucking past