Increase tests code coverage

[codecov[bot]]

Codecov Report

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

Project coverage is 87.27%. Comparing base (1b0809f) to head (9fd183f). Report is 106 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #103 +/- ## ========================================== + Coverage 86.45% 87.27% +0.81% ========================================== Files 51 51 Lines 3050 3050 Branches 495 495 ========================================== + Hits 2637 2662 +25 + Misses 276 251 -25 Partials 137 137 ``` | [Flag](https://app.codecov.io/gh/SciQLop/speasy/pull/103/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SciQLop) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/SciQLop/speasy/pull/103/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SciQLop) | `86.62% <100.00%> (+0.19%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SciQLop#carryforward-flags-in-the-pull-request-comment) to find out more.

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