[Task] Add unit test cases for useMessagesInternal 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 useMessagesInternal hook.

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

[Goketech]

I opened a pull request for this issue, pr 234