They are far from existing. Right now the only workable test for the virus is a genetic fingerprint via PCR. This takes time and needs both a lab and some very specific reagents which the CDC is presently having trouble producing.

If you develop severe symptoms, wear a mask (either sterilize it or use disposables), call the hospital and talk with them about it. If they tell you to come in, they will take the necessary precautions to make sure you don't infect anyone else.