[wp-trac] [WordPress Trac] #52451: Make the media sideload functions testable and add tests

[WordPress Trac]

#52451: Make the media sideload functions testable and add tests
----------------------------+------------------------------
 Reporter:  hellofromTonya  |       Owner:  (none)
     Type:  enhancement     |      Status:  new
 Priority:  normal          |   Milestone:  Awaiting Review
Component:  Media           |     Version:
 Severity:  normal          |  Resolution:
 Keywords:                  |     Focuses:
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Comment (by hellofromTonya):

 For reference, the drivers for this ticket were discussed in #core-media
 slack (links below) initiated by Ticket #50972.

 Links to slack discussions prior to opening this ticket:

 - [https://wordpress.slack.com/archives/C02SX62S6/p1603981803493000
 Comments by @johnbillion]
 >Might be difficult for the same reason the new filter in
 `media_sideload_image` didn't get a test, those functions aren't very
 testable without refectoring
 >
 >The sideloading functions could all do with a refactor to make them
 testable

 - [https://wordpress.slack.com/archives/C02SX62S6/p1612452539251000
 Discussion in Media meeting starts here].

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Ticket URL: <https://core.trac.wordpress.org/ticket/52451#comment:1>
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