There seems to be an issue and the test has not started yet. If you are on macOS, you must be using Catalina 10.15 or above for the test to work. Otherwise, please consider refreshing the page and trying again. If you tried refreshing, you likely need to update to the latest BCS driver. Latest version found here.
If you ran this test on a prior date and it is no longer working, it may be due to a browser update, and you will need to update to the latest BCS driver. Latest version found here at the bottom of the page