Add tests for ConnectionFS

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +3.37 :tada:

Comparison is base (f6e2d20) 87.46% compared to head (5bff5cc) 90.84%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #669 +/- ## ========================================== + Coverage 87.46% 90.84% +3.37% ========================================== Files 9 9 Lines 407 404 -3 Branches 84 84 ========================================== + Hits 356 367 +11 + Misses 31 20 -11 + Partials 20 17 -3 ``` | [Impacted Files](https://app.codecov.io/gh/redhatcloudx/transformer/pull/669?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=redhatcloudx) | Coverage Δ | | |---|---|---| | [src/cloudimagedirectory/connection/connection.py](https://app.codecov.io/gh/redhatcloudx/transformer/pull/669?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=redhatcloudx#diff-c3JjL2Nsb3VkaW1hZ2VkaXJlY3RvcnkvY29ubmVjdGlvbi9jb25uZWN0aW9uLnB5) | `100.00% <100.00%> (+25.92%)` | :arrow_up: |

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