Add async to test that was missing it

[lunkwill42]

Removes a repeated warning from the test suite, as this test function wasn't properly marked as an async function

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[github-actions[bot]]

Test results

    3 files      3 suites   49s :stopwatch: 315 tests 315 :heavy_check_mark: 0 :zzz: 0 :x: 945 runs  943 :heavy_check_mark: 2 :zzz: 0 :x:

Results for commit 7da6bae4.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.97%. Comparing base (5805c67) to head (7da6bae).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #228 +/- ## ========================================== - Coverage 98.97% 98.97% -0.00% ========================================== Files 47 47 Lines 6532 6529 -3 ========================================== - Hits 6465 6462 -3 Misses 67 67 ```

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