[wp-trac] [WordPress Trac] #53891: GH Actions: enable running the tests on PHP 8.1

[WordPress Trac]

#53891: GH Actions: enable running the tests on PHP 8.1
------------------------------+-----------------------------------
 Reporter:  jrf               |      Owner:  jrf
     Type:  task (blessed)    |     Status:  assigned
 Priority:  normal            |  Milestone:  5.9
Component:  Build/Test Tools  |    Version:
 Severity:  normal            |   Keywords:  has-patch php81 early
  Focuses:                    |
------------------------------+-----------------------------------
 PHP 8.1 is expected to be released end of November 2021.
 Enabling the tests to run in CI on PHP 8.1 will allow us to get WordPress
 ready in time.

 To allow for enabling the tests to run on PHP 8.1, quite some prep work
 needs/needed to be done ahead of the actual CI change.

 Preparation work already committed:
 * #47381 - removing of `composer.lock` file and switching to running the
 tests via Composer.
 * #46149 - making the test suite cross-version compatible with PHPUnit 5.x
 to 9.x
 * #53635 - [51517] patch `JsonSerializable_Object::jsonSerialize()` for
 compatibility with PHP 8.1

 Preparation work in progress:
 * #52825 - fix mysqli error handling for PHP 8.1.
 * #53858 - fix parse error in PHP 8.1 due to `readonly`

 Patches for these last two tickets need to be committed before PHP 8.1 in
 CI can be turned on as these are both causing fatal errors in the "Install
 WordPress" step before the actual test run.

 I'll be attaching a patch to this ticket for the CI change, but this patch
 can/should only be committed once the patches for the above two tickets
 are in.

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/53891>
WordPress Trac <https://core.trac.wordpress.org/>
WordPress publishing platform