Unit testing considerations and examples

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Here are some examples of unit tests in use in official Arduino firmware projects:

• https://github.com/arduino/ArduinoCore-API/tree/master/test/src
• https://github.com/arduino-libraries/ArduinoIoTCloud/tree/master/extras/test/src
• https://github.com/arduino-libraries/ArduinoBLE/tree/master/extras/test/src