Add Unit Tests for AsyncRequest Class

[sol-loup]

Add Unit Tests for AsyncRequest Class

Adds comprehensive unit tests for the AsyncRequest utility class. The tests verify:

• Proper initialization of the class with correct action hooks
• Request data handling via set_data()
• Dispatch functionality with appropriate URL and arguments
• Nonce verification in the request handling flow

The implementation uses PHPUnit's mocking capabilities to intercept WordPress HTTP requests, as it's less straightforward / efficient to record and playback real network calls.

I've verified that the changes originally pushed in #2901 and reverted in #2921 cause these tests to fail.

Closes # .

Replace this with a good description of your changes & reasoning.

• Do the changed files pass phpcs checks? Please remove phpcs:ignore comments in changed files and fix any issues, or delete if not practical.

Screenshots:

Detailed test instructions:

Additional details:

Changelog entry

[jczhuoMeta]

Looks good.

Thank you for adding the tests

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@sol-loup has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[facebook-github-bot]

@sol-loup merged this pull request in b59461b.