In the fight against COVID-19, it all starts with testing. Today, testing is the only effective tool for containing the pandemic to save lives and allow economies to reopen safely. Tomorrow, it will be needed to enable the success of global vaccination campaigns. We cannot afford for testing to remain overlooked in the global response. We need investment to deliver tests to the people who need them now, and produce easier-to-use and more affordable rapid tests to beat COVID-19 and save lives. We must unite to fight.