[wp-trac] [WordPress Trac] #65137: Unit Tests: Add tests for insert_with_markers()

[WordPress Trac]

#65137: Unit Tests: Add tests for insert_with_markers()
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 Reporter:  pbearne         |      Owner:  (none)
     Type:  enhancement     |     Status:  new
 Priority:  normal          |  Milestone:  Awaiting Review
Component:  Administration  |    Version:
 Severity:  normal          |   Keywords:
  Focuses:                  |
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 The function insert_with_markers() in src/wp-admin/includes/misc.php lacks
 unit tests. This PR adds tests to ensure it correctly inserts or replaces
 content between markers in a file, handles file creation, permissions, and
 respects existing content outside markers.

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Ticket URL: <https://core.trac.wordpress.org/ticket/65137>
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