[wp-trac] [WordPress Trac] #49663: Fix PHPUnit bootstrap to install from the same directory where the tests will be run

[WordPress Trac]

#49663: Fix PHPUnit bootstrap to install from the same directory where the tests
will be run
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 Reporter:  azaozz            |      Owner:  (none)
     Type:  defect (bug)      |     Status:  new
 Priority:  normal            |  Milestone:  5.5
Component:  Build/Test Tools  |    Version:  5.1
 Severity:  normal            |   Keywords:
  Focuses:                    |
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 After #44492 and #45863 when running `npm run test` or the equivalent
 `grunt build` followed by `phpunit`, WP is build to `/build` but
 `/tests/phpunit/includes/install.php` runs in `/src`.

 This triggers missing files errors if WordPress hasn't been built to
 `/src` before.

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Ticket URL: <https://core.trac.wordpress.org/ticket/49663>
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