Fix missing (void) in tests

[PJK]

Description

What changes and why

Checklist

• [ ] I have read followed CONTRIBUTING.md
  • [ ] I have added tests
  • [ ] I have updated the documentation
  • [ ] I have updated the CHANGELOG
• [ ] Are there any breaking changes?
  • [ ] If yes: I have marked them in the CHANGELOG (example)
• [ ] Does this PR introduce any platform specific code?
• [ ] Security: Does this PR potentially affect security?
• [ ] Performance: Does this PR potentially affect performance?

[codecov[bot]]

Codecov Report

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

Comparison is base (8c923de) 100.00% compared to head (fdfb241) 100.00%. Report is 6 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #300 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 20 20 Lines 1662 1662 ========================================= Hits 1662 1662 ```

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