Can a workplace force an employee to get tested for covid-19?

Employee testing: Per https://www.foley.com/en/insights/publications/2020/04/here-comes-mandatory-covid19-testing-employers ,The Americans with Disabilities Act requires that it be "job related and consistent with business necessity" for mandatory employee testing. The current pandemic would apply because an employee entering the workplace couse pose a direct threat to the health of another.