[wp-trac] [WordPress Trac] #40100: Get Travis tests working again on HHVM

[WordPress Trac]

#40100: Get Travis tests working again on HHVM
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 Reporter:  johnbillion       |      Owner:
     Type:  defect (bug)      |     Status:  new
 Priority:  normal            |  Milestone:  4.7.4
Component:  Build/Test Tools  |    Version:
 Severity:  normal            |   Keywords:  needs-patch
  Focuses:                    |
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 Another part of the push to get all of our Travis builds working again.

 The Travis jobs that run on HHVM have been erroring for a while now. This
 aims to fix that by:

 * Using PHPUnit 5.7 / 4.8 / 3.6 depending on the PHP version (5.7 for
 HHVM).
 * Correcting the path to Composer's global bin dir, which for some reason
 differs on the boxes that run HHVM.
 * Not breaking everything else at the same time.

 Note that the HHVM tests still fail, but that's a separate issue.

 Related: #40086, #39822, #35105

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Ticket URL: <https://core.trac.wordpress.org/ticket/40100>
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