Add test for `diagnostics`

[codecov[bot]]

Codecov Report

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

Project coverage is 77.87%. Comparing base (aae1b66) to head (a278b2a).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #119 +/- ## ========================================== + Coverage 75.91% 77.87% +1.96% ========================================== Files 8 8 Lines 357 357 ========================================== + Hits 271 278 +7 + Misses 86 79 -7 ```

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[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