Make two tests in test_testing async

[elemoine]

Use sync_wait in test_listen_for_jobs_run and test_wait_for_jobs and get rid of the "coroutine 'xxxx' was never awaited" warnings in the test output.

Make test_listen_for_jobs_run and test_wait_for_jobs async and get rid of the "coroutine 'xxxx' was never awaited" warnings in the test output.

Fixes #127.

Successful PR Checklist:

• Tests
• Documentation (optionally: run spell checking) Not relevant
• Had a good time contributing? (if not, feel free to give some feedback)

[codecov-io]

Codecov Report

Merging #128 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #128   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          19     19           
  Lines         733    733           
  Branches       70     70           
=====================================
  Hits          733    733

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[elemoine]

@ewjoachim I updated my branch.

[ewjoachim]

Perfect :)