Unit tests for sensor module code

[okyang]

When others build this project it would be good to have some unit tests to see if everything on the software side is working while also checking some of the hardware. Having unit tests would be a useful feature and would be a great sanity checker.

Here are a couple possible tests to write (feel free to add more):

• ultrasonic sensor reading works
• photos can be taken
• flash turns on and off appropriately
• deep sleep works
• network is successfully connected

[okyang]

Recommended software to use for unit testing: https://docs.platformio.org/en/latest/tutorials/core/unit_testing_blink.html.

Thanks @patrickanguyen for the suggestion! 🌱