fix: Add unit test cases for BotTypingIndicator component #339

[nove-b]

Description

Added test code for the BotTypingIndicator component.

Closes #339

What change does this PR introduce?

Please select the relevant option(s).

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update (changes to docs/code comments)

What is the proposed approach?

We added a test suite to ensure the basic rendering of the BotTypingIndicator component and to confirm that the props work as expected.

Checklist:

• The commit message follows our adopted guidelines
• Testing has been done for the change(s) added (for bug fixes/features)
• Relevant comments/docs have been added/updated (for bug fixes/features)

[tjtanjin]

LGTM, thanks for the PR! 😊