Comment by officialchicken

I don't use the the builtin testing framework, or std, and I often explicitly use a no-heap crate. Check out Embassy and you'll be free to ignore pretty almost everything suggested here, especially when developing and testing. I create a separate [bin] for each test (I usually run out of flash to fit all the tests into a single binary), and a few lines of bash/python to make a test runner/reporter for all the flashing and running of tests. Sometimes I flash up to 50 times a day and haven't lost an MCU (AVR-Rust, ESP-Rust, STM-Rust) yet due to too many writes.

[0] https://github.com/embassy-rs/embassy