[Task] Add unit test cases for useStylesInternal hook

[tjtanjin]

Task Description:
Currently, we run unit tests using jest which can be found here.

However, the test cases are not yet comprehensive enough and work can be done to cover more grounds. Specifically for this issue, we hope to add test cases for the useStylesInternal hook.

Deliverable(s):
New unit test cases that cover the testing of the useStylesInternal hook.

Additional Context:

• Hooks API can be found here
• Existing unit test for hooks can be found here which may serve as a good source for reference.

[mashazyu]

Hello @tjtanjin ,

If the issues still available, I'd like to work on it.

[tjtanjin]

Hello @tjtanjin ,

If the issues still available, I'd like to work on it.

Go for it!