38197 added unit tests for pingback

[pbearne]

Trac ticket: https://core.trac.wordpress.org/ticket/38197

[github-actions]

The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs. You can also manually ask me to refresh this list by adding the props-bot label.

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Props coquardcyr, flixos90.

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[github-actions]

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[felixarntz]

@pbearne Thanks for the PR, LGTM!

We only need to adjust the version annotation.

[github-actions]

A commit was made that fixes the Trac ticket referenced in the description of this pull request.

SVN changeset: 59818
GitHub commit: 626d9af

This PR will be closed, but please confirm the accuracy of this and reopen if there is more work to be done.