You've had the usual emotive responses below, but the reality is that we should absolutely be questioning the response, and whether it's proportionate.
This isn't about company profits or people being annoyed about the pub being closed. This is about people's livelihood, poverty, mental and physical wellbeing, and generating the tax revenue we need to fund our healthcare, social care, education, police and more.
It's also about decimating people's savings and pensions.
There is a massive lack of reliable data and conflicting opinions from various experts. I've no issue with the lockdown as it stands at the moment and I'm carefully observing it (as the vast majority of people seem to be doing), but it's far more than the "inconvenience" that many are portraying is. The lockdown is going tear a hole in our nation's finances that we'll be paying for for a generation. I just hope it doesn't turn out to have been needlessly self-inflicted due to bad advice.
As for your point on testing, keep in mind that there are two types of test. One to check whether you currently have it, and one to check whether you have already had it (I think it's about 28 days after infection that this becomes reliable). The former is urgently required to get key workers back to work as quickly as possible. The latter is required to understand how widespread the infection is in the general population so we can start to calculate how dangerous COVID-19 actually is.