Thanks for the interest in the project! The project is currently run by me, @madsmtm, but I am developing this project for the Rust community, with the goal of at some point integrating it into Cargo proper, so I'm very open to contributions.
Feel free to just submit a PR!
Simply running cargo test should work.
To run a locally built cargo-sandbox, make sure to first run cargo build. This will build both cargo-sandbox and cargo-sandbox-interceptor. After that, you should be able to run something like this:
$ $MY_PROJECT_DIR/target/debug/cargo-sandbox buildNote that cargo run will NOT rebuild the interceptor, so using this for development is discouraged.