:white_check_mark: Add unit test for signing init

[codecov[bot]]

Codecov Report

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

Comparison is base (5c352c4) 34.16% compared to head (4d0d601) 34.50%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #281 +/- ## ========================================== + Coverage 34.16% 34.50% +0.34% ========================================== Files 132 131 -1 Lines 9244 9074 -170 ========================================== - Hits 3158 3131 -27 + Misses 5765 5628 -137 + Partials 321 315 -6 ``` | [Flag](https://app.codecov.io/gh/go-sigma/sigma/pull/281/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=go-sigma) | Coverage Δ | | |---|---|---| | [unit-test-mysql](https://app.codecov.io/gh/go-sigma/sigma/pull/281/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=go-sigma) | `34.50% <ø> (+0.34%)` | :arrow_up: | | [unit-test-postgresql](https://app.codecov.io/gh/go-sigma/sigma/pull/281/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=go-sigma) | `34.50% <ø> (+0.34%)` | :arrow_up: | | [unit-test-sqlite3](https://app.codecov.io/gh/go-sigma/sigma/pull/281/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=go-sigma) | `34.50% <ø> (+0.34%)` | :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=go-sigma#carryforward-flags-in-the-pull-request-comment) to find out more.

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