Click on the test you want to run, press space to end the test (may be a bit buggy, try holding space) How to run tests the camera test uses face sensing, enable your camera and see if it detects your face (feel free to read more about face sensing) The internet test tries to translate. If it can't (due to internet loss, it needs internet), it will show you that it isn't connected to the microphone test detects microphone loudness so speak in your microphone
Thanks to @ScratchGuy-_- for the internet detector code My camera isn't working when I'm making this (LOL), so tell me if this works in the comments