Add more tests to improve code coverage

[codecov[bot]]

Codecov Report

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

Project coverage is 99.54%. Comparing base (b5d5a3f) to head (f3057c9).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #215 +/- ## ========================================== + Coverage 99.02% 99.54% +0.52% ========================================== Files 2 2 Lines 1333 1333 ========================================== + Hits 1320 1327 +7 + Misses 13 6 -7 ```

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