unittests: Move at test to driver tests

[Teufelchen1]

Contribution description

Hi 🦜

This moves the unit test for the at driver into the folder for driver tests. The test accesses/depends on hardware which is not valid for a unit test.

Further, the original test disabled UART_DEV(0) which I changed to UART_DEV(1). This is needed as some boards use device zero for stdio and you can not have a good testing experience without stdio.
Please provide feedback on this workaround, I am unsure on the quality of it.

Testing procedure

Running make -C tests/drivers/at_unit/ all flash should provide this output upon success:

# main(): This is RIOT! 
# AT unit-like test
# 
# .......
# OK (7 tests)

Issues/PRs references

Introduced in commit 63e057c by PR #20423

[kfessel]

you are right even thought the test itself does not make use of the uart the driver/at that it tests depend on it

@derMihai might have some thoughts

[chrysn]

It's weird that there is a device involved that just gets turned off, but aparently that's how at_dev_init works (can't pass it the none-device), but that's beyond the scope of fixing it.

I don't know the precise workings of the AT module or this test, but as the test passes (doing things) for you, I think it's good.

[riot-ci]

Murdock results

✔️ PASSED

ac40354 tests/drivers/at_unit: Add Makefile.ci

Success	Failures	Total	Runtime
35	0	35	01m:02s

Artifacts

• Documentation preview

[Teufelchen1]

C is such a magic. A test that compiles and runs fine on my machine, suddenly misses a header on the CI.
@chrysn, I won't be able to fix that today (or even this weekend) could you fix up my branch? 👉 👈 Hardfreeze is on monday...

[chrysn]

Fixup passed. Let's try if I can force push too (not sure it really worked); at any rate, I'll let you do the merge pushing so you confirm my one-line addition.

[miri64]

Ah, please update the Makefile.ci with the arduino-duemilanove. It is too large for that board.

[chrysn]

This'll need Makefile.ci, building it already.

[miri64]

(maybe even more, but the full build stopped there)

[derMihai]

This PR does break a few things, see #20551.