How to Test Embedded Rust Code

Run cargo test in your project directory to execute all unit and integration tests for your embedded Rust code. For mdbook projects, you must first build external dependencies and then run mdbook test with the correct library path.

cargo test

For mdbook projects with external crates like trpl:

cd packages/trpl && cargo build
mdbook test --library-path packages/trpl/target/debug/deps

Testing verifies your code works correctly before you deploy it to a device. Think of it like a safety checklist for a car before you drive it; you run automated checks to ensure nothing is broken. This process catches bugs early so you don't have to debug them on expensive hardware later.