[wp-trac] [WordPress Trac] #46593: Fatal error when running unit tests without the build directory

[WordPress Trac]

#46593: Fatal error when running unit tests without the build directory
------------------------------+--------------------
 Reporter:  SergeyBiryukov    |      Owner:  (none)
     Type:  defect (bug)      |     Status:  new
 Priority:  normal            |  Milestone:  5.2
Component:  Build/Test Tools  |    Version:
 Severity:  normal            |   Keywords:
  Focuses:                    |
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 If you create a new checkout and attempt to run PHPUnit without running
 `grunt build` first, you'll get a fatal error:

 `Fatal error: require_once(): Failed opening required 'build//wp-includes
 /class-phpmailer.php' in tests/phpunit/includes/mock-mailer.php on line 2`

 There should be a proper error message with a recommendation to run `grunt
 build`.

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Ticket URL: <https://core.trac.wordpress.org/ticket/46593>
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