IMO if a band member asks for everyone to take a lateral flow test at short notice before a rehearsal, that's fine. It'll take a couple of minutes.
We're in strange times. It's OK to be inconvenienced a little more to reduce the risk as much as possible.
Sometimes you don't know how you'll feel until it comes to the crunch... like most of us, I'm desperate to gig again, and I've been sitting like a coiled spring waiting for the opportunity to come up.
A few days ago I was offered a gig for this weekend, but when I thought about it - and the fact that it was indoors - I actually declined. I surprised myself, but it didn't feel right to say yes.