[#noissue] Delete testcase directory

[codecov[bot]]

Codecov Report

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

Project coverage is 36.93%. Comparing base (cbcb173) to head (ccd90e9). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #11760 +/- ## ============================================ - Coverage 36.93% 36.93% -0.01% + Complexity 12412 12410 -2 ============================================ Files 4105 4105 Lines 100664 100664 Branches 10531 10531 ============================================ - Hits 37184 37179 -5 - Misses 60487 60491 +4 - Partials 2993 2994 +1 ```

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