[wp-trac] [WordPress Trac] #39241: Add more unit tests for the custom header feature

[WordPress Trac]

#39241: Add more unit tests for the custom header feature
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 Reporter:  bradyvercher  |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Themes        |    Version:
 Severity:  normal        |   Keywords:
  Focuses:                |
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 The custom header functionality is largely untested. I introduced some
 tests in #38639, but they got overlooked while focusing on getting 4.7 out
 the door, so I'd like to reintroduce them for inclusion.

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Ticket URL: <https://core.trac.wordpress.org/ticket/39241>
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