Improvement of test coverage of datasafe

[codecov[bot]]

Codecov Report

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

Project coverage is 86.34%. Comparing base (09e05bc) to head (3a56735). Report is 3 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #328 +/- ## ============================================= + Coverage 85.81% 86.34% +0.53% Complexity 1 1 ============================================= Files 165 165 Lines 3342 3340 -2 Branches 216 214 -2 ============================================= + Hits 2868 2884 +16 + Misses 338 326 -12 + Partials 136 130 -6 ```

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