bendrucker/random-url ? reverse-engineered prompt

Build me a small JavaScript package that generates a random URL.

I want it to be simple to use, so if I call it with no arguments it should give me a random http URL, and if I pass a protocol like https it should make a random URL with that protocol instead. Keep the API tiny and easy to require from Node.

Please include a few tests so I can trust that it works, especially for the default behavior and for a custom protocol. Make the package feel like a normal npm library I could publish and install with npm install. If you need to look up current docs or best practices for random URL generation, go ahead and check online.