Add more tests & fix linting

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (21a4bcd) 100.00% compared to head (880d893) 100.00%. Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #109 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 26 27 +1 Lines 1853 1882 +29 ========================================= + Hits 1853 1882 +29 ``` | [Files Changed](https://app.codecov.io/gh/jowilf/sqlalchemy-file/pull/109?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jocelin+Hounon) | Coverage Δ | | |---|---|---| | [sqlalchemy\_file/processors.py](https://app.codecov.io/gh/jowilf/sqlalchemy-file/pull/109?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jocelin+Hounon#diff-c3FsYWxjaGVteV9maWxlL3Byb2Nlc3NvcnMucHk=) | `100.00% <ø> (ø)` | | | [sqlalchemy\_file/file.py](https://app.codecov.io/gh/jowilf/sqlalchemy-file/pull/109?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jocelin+Hounon#diff-c3FsYWxjaGVteV9maWxlL2ZpbGUucHk=) | `100.00% <100.00%> (ø)` | | | [sqlalchemy\_file/storage.py](https://app.codecov.io/gh/jowilf/sqlalchemy-file/pull/109?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jocelin+Hounon#diff-c3FsYWxjaGVteV9maWxlL3N0b3JhZ2UucHk=) | `100.00% <100.00%> (ø)` | | | [sqlalchemy\_file/validators.py](https://app.codecov.io/gh/jowilf/sqlalchemy-file/pull/109?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jocelin+Hounon#diff-c3FsYWxjaGVteV9maWxlL3ZhbGlkYXRvcnMucHk=) | `100.00% <100.00%> (ø)` | | | [tests/test\_file.py](https://app.codecov.io/gh/jowilf/sqlalchemy-file/pull/109?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jocelin+Hounon#diff-dGVzdHMvdGVzdF9maWxlLnB5) | `100.00% <100.00%> (ø)` | | | [tests/test\_single\_field.py](https://app.codecov.io/gh/jowilf/sqlalchemy-file/pull/109?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jocelin+Hounon#diff-dGVzdHMvdGVzdF9zaW5nbGVfZmllbGQucHk=) | `100.00% <100.00%> (ø)` | | | [tests/test\_storage\_manager.py](https://app.codecov.io/gh/jowilf/sqlalchemy-file/pull/109?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jocelin+Hounon#diff-dGVzdHMvdGVzdF9zdG9yYWdlX21hbmFnZXIucHk=) | `100.00% <100.00%> (ø)` | |

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