[wp-trac] [WordPress Trac] #39978: Disable Xdebug during tests on Travis

[WordPress Trac]

#39978: Disable Xdebug during tests on Travis
------------------------------+-------------------------
 Reporter:  johnbillion       |      Owner:
     Type:  task (blessed)    |     Status:  new
 Priority:  normal            |  Milestone:  4.8
Component:  Build/Test Tools  |    Version:
 Severity:  normal            |   Keywords:  needs-patch
  Focuses:                    |
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 My local installation was running its tests 2x slower than I expected, and
 I narrowed down the problem to the Xdebug extension being unexpectedly
 enabled on the CLI. Disabling Xdebug restored the test suite speed back to
 its previous level.

 I did some research and it turns out Xdebug can be disabled on Travis.
 Refs:

 * https://docs.travis-ci.com/user/languages/php#Disabling-preinstalled-
 PHP-extensions
 * https://github.com/travis-ci/travis-ci/issues/444
 * https://github.com/travis-ci/travis-ci/issues/5780

 It would be worth pushing a change which disables Xdebug for core to see
 if it speeds things up (it should) and to see if it breaks anything (it
 shouldn't).

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Ticket URL: <https://core.trac.wordpress.org/ticket/39978>
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