Unit Tests file for post_modal widget

[VertikaBajpai]

This change included the Unittest for post_modal widget.

Issue Number: #2150
Fixed: #2150

Did you add tests for your changes?

Yes

Summary

It is unit test for post_modal widget.

Does this PR introduce a breaking change?

No, this does not introduce any major changes to the codebase.

Have you read the contributing guide?

Yes, I have read and followed the guidelines.

[github-actions]

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[Cioppolo14]

@VertikaBajpai Please fix the failing tests. Our test code coverage system will fail if any of these conditions occur:

1. The overall code coverage drops below the target threshold of the repository
2. Any file in the pull request has code coverage levels below the repository threshold
3. The code does not comply with our linting check or other related formatting requirements

We do this to ensure the overall reliability of the code base is maintained. This is a prerequisite for getting your PR approved. Assigned reviewers regularly review the PR queue and tend to focus on PRs that are passing.

[github-actions]

This pull request did not get any activity in the past 10 days and will be closed in 180 days if no update occurs. Please verify it has no conflicts with the develop branch and rebase if needed. Mention it now if you need help or give permission to other people to finish your work.

[palisadoes]

Closing due to inactivity