Example with an external board
This tests an external board implementation. The goal is to show using an external board that still needs to use the 'RIOT/boards' directory.
To allow automated testing by murdock this board is named 'native'.
As it wants to extend native, which is not a common board, some hacks must be done as the 'board' module is implemented directly by the 'RIOT/boards/native'.
If you are running an 'ubuntu-bionic' you could even compile the example in docker and run the test.