[riot-notifications] [RIOT-OS/RIOT] tests/periph_rtt_min: harden test (#16314)

Martine Lenders notifications at github.com
Mon Apr 12 11:48:37 CEST 2021

The RIOT community cares a lot about code quality.
Therefore, before describing what your contribution is about, we would like
you to make sure that your modifications are compliant with the RIOT
coding conventions, see https://github.com/RIOT-OS/RIOT/wiki/Coding-conventions.

### Contribution description
This fixes a test that regularly fails in the nightlies due to a timeout in catching its flashed dots:

- Better self-containment: read number of expected samples from output
  rather than the environment
- Less reliance on `stdout` timing: Count samples in application and
  output it rather then counting flushed dots.
Put here the description of your contribution:
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- if it's a bug fix, describe the bug that it solves and how it is solved
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### Testing procedure
$ make -C tests/periph_rtt_min -j flash test

should still succeed
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- which test/example to compile for which board and is there a 'test' command
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### Issues/PRs references
Examples: Fixes #1234. See also #5678. Depends on PR #9876.

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-- Commit Summary --

  * tests/periph_rtt_min: harden test

-- File Changes --

    M tests/periph_rtt_min/Makefile (2)
    M tests/periph_rtt_min/main.c (5)
    M tests/periph_rtt_min/tests/01-run.py (13)

-- Patch Links --


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