Not that simple because of the incubation period. You can test negative today but still contagious.They wouldn't be mandating masks and social distancing. They would mandate testing and quarantine those who test positive and let those who test negative go on their merry way.
What is very simple, wear a mask when you can't be 6 feet apart and wash your hand frequently.
If anyone thinks this is hoax, then I guess the patients my wife has seen die was fake as well.