Beijing on Tuesday launched mass coronavirus testing for nearly all its 21 million residents, as fears grew that the Chinese capital may be placed under a strict lockdown like Shanghai. Under its zero-Covid policy, China has used lockdowns, mass testing and travel restrictions to stamp out infections. Its biggest city, Shanghai, has been almost entirely locked down for weeks, and the mass testing order in Beijing has sparked worries the capital will be placed under similar restrictions. “Shanghai’s situation has gone beyond everyone’s imagination, and many people think it’s absurd that a moder…