Hi Dan! Good to see you here!
I would recommend connecting with Jon Reid if you haven't already, he is sharing a lot about TDD on iOS. Here are some links:
twitter -> @qcoding
mastodon -> iosdev.space/@qcoding
That might help you get in touch with a wider group of ppl doing TDD on iOS.
Cheers!
Jov
Jovche Mitrejchevski