Add support for FuzzManager test cases that are not zip files

[codecov[bot]]

Codecov Report

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

Comparison is base (3c46ee7) 99.56% compared to head (6b99691) 99.56%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #407 +/- ## ======================================= Coverage 99.56% 99.56% ======================================= Files 52 52 Lines 5531 5551 +20 ======================================= + Hits 5507 5527 +20 Misses 24 24 ```

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