Refactor movetest.py

[lieryan]

Description

Some refactoring on movetest.py, adding type hints, and misc.

Checklist (delete if not relevant):

• [x] I have added tests that prove my fix is effective or that my feature works
• [x] I have updated CHANGELOG.md

[codecov[bot]]

Codecov Report

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

Project coverage is 94.88%. Comparing base (186f2ed) to head (3be1fd4). Report is 20 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #785 +/- ## ========================================== + Coverage 94.86% 94.88% +0.01% ========================================== Files 135 135 Lines 26405 26403 -2 ========================================== + Hits 25050 25053 +3 + Misses 1355 1350 -5 ```

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