Influenza test is like Covid test at the doctors

Covid changed even Influenza testing. Yesterday I went to the doctor here in Korea because I was feeling sick for over 3 days already and they asked if I want a test. I didn't quite understand for what and thought it's necessary so I said yes. It was the same as for Covid, they tickle your brain with a stick through your nose. After 5 minutes the test came back negative, I don't have Influenza. They charged me $28, I guess most of it was for the test itself, the rest should have been covered by my insurance.