Added test cases.

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.12% :tada:

Comparison is base (9a2066d) 99.87% compared to head (ab9b9f0) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #192 +/- ## =========================================== + Coverage 99.87% 100.00% +0.12% =========================================== Files 14 14 Lines 1581 1581 =========================================== + Hits 1579 1581 +2 + Misses 2 0 -2 ``` | [Files Changed](https://app.codecov.io/gh/jonasbkarlsson/ev_smart_charging/pull/192?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonas+Karlsson) | Coverage Δ | | |---|---|---| | [custom\_components/ev\_smart\_charging/coordinator.py](https://app.codecov.io/gh/jonasbkarlsson/ev_smart_charging/pull/192?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jonas+Karlsson#diff-Y3VzdG9tX2NvbXBvbmVudHMvZXZfc21hcnRfY2hhcmdpbmcvY29vcmRpbmF0b3IucHk=) | `100.00% <100.00%> (+0.56%)` | :arrow_up: |

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