Our primary hasn't mentioned testing. It's bad enough trying to brush the DC's teeth!
I'm not sure that I could safely get DS1 tested even if we had to so might have to go down the precautionary isolation route in the event of symptoms.
At the moment our neighbourhood has been loitering at 2-4 cases per week. Other than the DCs going to school and my weekly late night shopping in empty supermarkets, we're not doing anything indoors. So for the next while the only place where we'd feasibly become exposed is via school itself, which means another classmate had it first anyway... or staff...
Playground rumours were a parent testing positive from another year group, spouse has LFTs for work so they probably picked it up via that method, but it's not spread into that year group. That child has no in-school siblings so it would be pretty contained amyway.