No, at most you can say it requires a way to introduce those chemicals into the bloodstream in the brain. Actually, all you need is a way to stimulate the same

No, at most you can say it requires a way to introduce those chemicals into the bloodstream in the brain. Actually, all you need is a way to stimulate the same receptors that are stimulated by those chemicals. Just as with unit testing, you don't actually need to hook up your SUT to a real environment, you just need to hook it up to something that will exercise the same interface as a real environment.