test: adding more unit tests

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (b950acc) 16.52% compared to head (8e5ccf7) 40.44%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #107 +/- ## =========================================== + Coverage 16.52% 40.44% +23.91% =========================================== Files 3 3 Lines 363 361 -2 =========================================== + Hits 60 146 +86 + Misses 303 215 -88 ``` | [Files](https://app.codecov.io/gh/design1online/WTF-Adventure/pull/107?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | Coverage Δ | | |---|---|---| | [client/index.js](https://app.codecov.io/gh/design1online/WTF-Adventure/pull/107?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-Y2xpZW50L2luZGV4Lmpz) | `40.60% <ø> (+28.27%)` | :arrow_up: | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/design1online/WTF-Adventure/pull/107/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None)

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