HONG KONG—Some law firms and banks in Hong Kong face compulsory COVID-19 testing as most of the 47 news cases recorded on Saturday were linked to a gym used by the financial and expatriate community. The city’s government said 35 of the new cases were related to the outbreak at Ursus Fitness, a gym in the city’s Sai Ying Pun district. The health department told a briefing that so far 99 cases have been confirmed as related to the center, which is popular with expatriate lawyers, bankers, and hedge fund executives. The government published a compulsory testing notice on Friday covering 80 residential premises and workplaces, many in central financial and business district. Many of the 29 workplaces affected are leading law firms and financial institutions, including Shearman & Sterling, Allen & Overy, Herbert Smith Freehills, HSBC, Credit Suisse, BNP Paribas, and BNY Mellon. The compulsory testing notice is published …