chore: add some unit tests

[namchuai]

Describe Your Changes

• Adding unit test for finding suitable hardware.
• Fix mac build issue with unit test.

Screenshot

Fixes Issues

• epic: unitest for cortex cpp #1069

Self Checklist

• Added relevant comments, esp in complex areas
• Updated docs (for bug fixes / features)
• Created issues for follow-up changes or refactoring needed

[dan-homebrew]

@namchuai: A few PM requests from me (once you finish your draft)

• PR requires better description - can you add that?
• Can you link the issues using the #fixes (i.e. related to, but doesn't close)
• e.g. epic: cortex engines commands #1072

In the future, I would push for you guys to include unit tests with the issue-closing PR, so it's easier to refer to. But for now, I really appreciate the push to increase test coverage

[vansangpfiev]

Thank you for adding unit tests

[dan-homebrew]

Lgtm - thanks for writing tests