[Test] Add unit tests for js/utils/mb-dialog.js

[eyeaadil]

What needs testing

js/utils/mb-dialog.js currently has no associated test suite in the repository.

Current coverage

Current test coverage for this file is 0% (there is no test file).

Proposed approach

I propose creating js/utils/tests/mb-dialog.test.js using the Jest framework and jsdom to write a comprehensive test suite. The approach will cover:

• Toggling default vs custom dialog parameters for window.MBDialog.alert.
• Testing the Promise-based interface and resolution flow of window.MBDialog.prompt.
• Verifying DOM rendering, styling, and post-close cleanup for the overlay and frame.
• Validating keyboard accessibility bindings (Escape to cancel, Enter to submit).
• Verifying the theme initialization fallback chain (localStorage checking vs matchMedia preferred-color-scheme).
• Verifying mouse dragging behavior on the dialog title bars.

Checklist

• I have read and followed the project's code of conduct.
• I have checked that no existing tests cover this area.
• I have checked that there is no open PR for the tests I am submitting.
• I have reviewed docs/TESTING.md for testing patterns.

[durancodes]

Hi, I’d like to work on this issue. It seems related to missing test dependency setup. I’ll investigate and propose a fix.

Thanks!

[eyeaadil]

Hi, I’d like to work on this issue. It seems related to missing test dependency setup. I’ll investigate and propose a fix.

Thanks!

I had implemented this and I make PR for this issue , you can check some other issue.

[durancodes]

Ok