Change testcase index to speed up quality calculations

[codecov[bot]]

Codecov Report

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

Project coverage is 69.77%. Comparing base (aa22ecb) to head (62ffb96). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1013 +/- ## ========================================== + Coverage 69.75% 69.77% +0.01% ========================================== Files 155 156 +1 Lines 9347 9352 +5 Branches 45 45 ========================================== + Hits 6520 6525 +5 Misses 2806 2806 Partials 21 21 ```

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