[wp-trac] [WordPress Trac] #36587: PHPUnit Tests fail with PHP7 and Imagick 3.4.x

[WordPress Trac]

#36587: PHPUnit Tests fail with PHP7 and Imagick 3.4.x
--------------------------+--------------------
 Reporter:  alpipego      |       Owner:
     Type:  defect (bug)  |      Status:  new
 Priority:  high          |   Milestone:  4.6
Component:  Media         |     Version:  trunk
 Severity:  normal        |  Resolution:
 Keywords:                |     Focuses:
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Changes (by ocean90):

 * priority:  normal => high
 * milestone:  Awaiting Review => 4.6


Comment:

 Thanks for creating the ticket @alpipego!

 This issue was discovered during the Contributor Day at WordCamp Nuremberg
 and took quite a while to find the cause. :(
 [[BR]]

 > This causes the PHPUnit test to throw errors (~290) and ultimately
 several failures.

 Correct, most of the errors where caused by "headers already sent"
 warnings as soon as the image tests ran.

 {{{
 ImagickException: Cannot modify header information - headers already sent
 by (output started at /tests/phpunit/includes/bootstrap.php:56)
 }}}

 [attachment:phpunit.log] includes the output of a broken test run.

 While it looks like it's currently only happing with our test image I'm
 sure that this could be an issue in a real life scenario too.

 The change is probably related to
 http://php.net/manual/en/language.errors.php7.php.

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Ticket URL: <https://core.trac.wordpress.org/ticket/36587#comment:1>
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