test: add more test about scalue down replicant

[codecov[bot]]

Codecov Report

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

Comparison is base (f88dc73) 76.95% compared to head (822366a) 76.82%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1004 +/- ## ========================================== - Coverage 76.95% 76.82% -0.14% ========================================== Files 67 67 Lines 6141 6141 ========================================== - Hits 4726 4718 -8 - Misses 1192 1197 +5 - Partials 223 226 +3 ```

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