I don’t own the vehicle I am going to be taking the drivers test in, my girlfriend is letting me use her car. She has an Austin drivers license, on my learners permit it says she has to have a California license. Is this true?

Yes you need a California driver w lisence. I just did my driver test. 2 months. Ago

You can take the test in your girlfriend's car.

When taking the driver test you don't have to have your own car are you do have to be accompanied by someone who is license not sure if they have to be a California license you may want to check with DMV directly good luck to you