[wp-trac] [WordPress Trac] #51705: Trim the test matrix on Travis for 5.3-5.5 branches

[WordPress Trac]

#51705: Trim the test matrix on Travis for 5.3-5.5 branches
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 Reporter:  desrosj           |      Owner:  desrosj
     Type:  task (blessed)    |     Status:  assigned
 Priority:  normal            |  Milestone:  5.6
Component:  Build/Test Tools  |    Version:
 Severity:  normal            |   Keywords:
  Focuses:                    |
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 It's time to trim the test matrix for the 5.3-5.5 branches.

 Following the practices for older branches established in previous tickets
 (#41707, #42626, #42387, #48413), these changes should be made for 5.3 &
 5.4:
 - Remove PHP jobs for PHP 7.1, 7.2, and 7.3 without Memcached.

 For 5.3-5.5 branches:
 - Remove all allowed failures (these will never be fixed to pass).

 We could also remove the E2E test job as well. There is currently only 1
 E2E test present, and it only confirms that the test suite run.

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Ticket URL: <https://core.trac.wordpress.org/ticket/51705>
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