[riot-notifications] [RIOT-OS/RIOT] tests/xtimer_usleep: recognize negative offset (#11493)

Francisco notifications at github.com
Tue May 7 08:54:08 CEST 2019

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This PR modifies xtimer_usleep automated test to recognize negative offset with respect to target sleep time.

When reviewing #11044 I realized tests/xtimer_usleep wasn't passing because the python script was not recognizing negative integers as acceptable values for the timer offset, this is done now.

### Testing procedure

With frdm-kw41z or usb-kw41z (or any board witch would produce negative offset with respect to the target usleep time)

`→ make -C tests/xtimer_usleep BOARD=usb-kw41z flash test

Failed without this PR, succeeds with it.

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-- Commit Summary --

  * tests/xtimer_usleep: recognize negative offset

-- File Changes --

    M tests/xtimer_usleep/tests/01-run.py (2)

-- Patch Links --


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