Hello James, thank you so much I’m really glad you enjoyed the article! And also thank you for sharing your story. I think it helps all of us a lot to hear how we’ve each dealt with this situation and be inspired by each other.
For what it’s worth I think you handled it like a professional would. If companies can’t see quality when it’s staring them dead in the face, well, there are many other companies out there who might. If we all simply refuse, it might be the end of uncompensated design tests.
I wish you best of luck with your job search and thank you again!