No. Truthfully, I feel like part of the point of a book (as opposed to other more collaborative media) is that it is for better or worse the expression of a single individual. If I tested pieces of it, I'm afraid the whole would suffer.

Now, I do have some beta readers in my orbit who are kind enough to read early drafts and tell me what they thought. And I often sit down with author pals to debrief and share our woes and offer advice to each other. But that's not exactly what you're asking about.

Thanks for the question!