[wp-trac] [WordPress Trac] #54713: Build/Test Tools: Add unit tests for `feed_links_extra()`.

[WordPress Trac]

#54713: Build/Test Tools: Add unit tests for `feed_links_extra()`.
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 Reporter:  costdev           |      Owner:  costdev
     Type:  task (blessed)    |     Status:  assigned
 Priority:  normal            |  Milestone:  5.9
Component:  Build/Test Tools  |    Version:
 Severity:  normal            |   Keywords:
  Focuses:                    |
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 `feed_links_extra()` currently has no test coverage.

 This ticket aims to add 100% line/branch coverage to `feed_links_extra()`.

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Ticket URL: <https://core.trac.wordpress.org/ticket/54713>
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