Add test for #192: fatal error: 'Adafruit_SPIDevice.h' file not found

[jgfoster]

This should make it easier to debug #192.

[ianfixes]

The motivation behind this PR seems to be illustrating the problem fixed by #213 but this doesn't quite close the loop... this project doesn't get included in the CI config.

I'm wondering if https://github.com/Arduino-CI/arduino_ci/tree/master/SampleProjects/DependOnSomething could be adapted to perform this test.

[jgfoster]

This is illustrating the problem reported in #192 (not #213) which is not yet fixed. It wasn't added to CI because it would cause the CI to fail. Once #192 is fixed then we can include it into the CI. Testing it elsewhere would be fine; I just wanted to give you a simple failing test.

[jgfoster]

Replace with PR to tdd branch.

[ianfixes]

Rolled into #223 and merged

[ianfixes]

I got an email that

I find that #212 still fails so this doesn't seem to be fixed.

I don't see that comment here so I assume it was retracted. Please open a new issue if the problem comes back, as #218 will have affected quite a few things

[jgfoster]

Yes, I discovered that the problem was elsewhere.