Add more tests

[AttackingOrDefending]

Type of pull request:

• [ ] Bug fix
• [ ] Feature
• [x] Other

Description:

Add some tests for external moves. A lot more should be added before #920 can be closed. Also fixes a bug in engine_wrapper found while creating these tests.

Related Issues:

920

Checklist:

• [x] I have read and followed the contribution guidelines.
• [x] I have added necessary documentation (if applicable).
• [x] The changes pass all existing tests.

Screenshots/logs (if applicable):