When Tesla's Shanghai plant and other auto factories were shut over the last two months by emergency measures to control China’s biggest COVID-19 outbreak, the burning question was how quickly they could restart to meet surging demand.

But with the Shanghai lockdown grinding into its fourth week, and similar measures imposed in dozens of smaller cities, the world’s largest boom market for electric cars has gone bust.

Other companies from luxury goods makers to fast-food restaurants have also offered a first read on the lost sales and shaken confidence of recent weeks, even as Beijing rolls out measures to help COVID-hit industries and stimulate demand.