In Austin, Planned Parenthood requires a name, but doesn't check ID if you pay cash. $100 or so for the most common tests. Give them your hobby cell phone number.

They might ask for ID if your tests come out positive, but that's never happened to me, so I'm not sure. There's probably a reporting requirement if you test positive.

Remember, even if you've been infected, you may not test positive for a while after the exposure. Ask the people at the clinic for details. Even if your accidental BB partner tests negative, she could have been infected recently and not test positive yet. Each test has its own delays. Get tested again 6 months after the exposure.