[wp-trac] [WordPress Trac] #60610: Consider fixing user mistakes and/or adding unit tests for $preferred_ext in wp_mime_type_icon()

[WordPress Trac]

#60610: Consider fixing user mistakes and/or adding unit tests for $preferred_ext
in wp_mime_type_icon()
-------------------------+-----------------------------
 Reporter:  sabernhardt  |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  Media        |    Version:  trunk
 Severity:  normal       |   Keywords:
  Focuses:               |
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 Follow-up to ticket:31352#comment:54

 The `$preferred_ext` value for `wp_mime_type_icon()` begins with a period,
 and developers might miss that. The function could check the first
 character and add the dot if it does not exist there. The function also
 could ensure that the letters are lowercase.

 For unit tests, the `test_wp_mime_type_icon_video` test in
 `post/attachments.php` checks the default `$preferred_ext` parameter
 value. Adding at least one more test with a specific `$preferred_ext`
 could help.

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Ticket URL: <https://core.trac.wordpress.org/ticket/60610>
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