test(taiko-client): enable a skipped unit test

[codecov[bot]]

Codecov Report

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

Project coverage is 48.53%. Comparing base (f53766b) to head (828ab57). Report is 534 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #17165 +/- ## =========================================== + Coverage 26.82% 48.53% +21.71% =========================================== Files 105 57 -48 Lines 6188 5779 -409 =========================================== + Hits 1660 2805 +1145 + Misses 4348 2670 -1678 - Partials 180 304 +124 ``` | [Flag](https://app.codecov.io/gh/taikoxyz/taiko-mono/pull/17165/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=taikoxyz) | Coverage Δ | | |---|---|---| | [eventindexer](https://app.codecov.io/gh/taikoxyz/taiko-mono/pull/17165/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=taikoxyz) | `?` | | | [guardian-prover-health-check](https://app.codecov.io/gh/taikoxyz/taiko-mono/pull/17165/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=taikoxyz) | `?` | | | [relayer](https://app.codecov.io/gh/taikoxyz/taiko-mono/pull/17165/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=taikoxyz) | `?` | |

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