[wp-trac] [WordPress Trac] #46149: PHPUnit 8.x support

[WordPress Trac]

#46149: PHPUnit 8.x support
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 Reporter:  SergeyBiryukov                       |       Owner:  netweb
     Type:  task (blessed)                       |      Status:  assigned
 Priority:  high                                 |   Milestone:  5.9
Component:  Build/Test Tools                     |     Version:
 Severity:  normal                               |  Resolution:
 Keywords:  has-patch has-unit-tests early php8  |     Focuses:
  needs-dev-note                                 |
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Comment (by hellofromTonya):

 During today's working session with @johnbillion @SergeyBiryukov @jrf
 @nextweb and me ([https://youtu.be/SAtiKaUwLU4 see the live stream here]),
 we discussed and reached consensus on adopting the practice of building
 tests to the latest PHPUnit version:

 - Adopt [https://github.com/Yoast/PHPUnit-Polyfills PHPUnit Polyfills] to
 shim backwards for cross-version compatibility
 - Add an adapter layer between the tooling and Core's test cases for
 future flexibility
 - Change the inheritance order
 - Remove the copied PHPUnit files and PHPUnit assertions
 - Adopt Polyfills snakecase fixture methods (as PHPUnit 8 method
 signatures changed) -> this is a breaking change for extenders who are
 using fixture methods in their tests
 - Help extenders with this breaking change (new ticket coming)
 - Get the atomic commits ([https://github.com/jrfnl/wordpress-develop-
 official/commits/WIP/all-stacked-in-the-right-
 order?before=189e88d915151987e208ec54bb350a6bc82477b1+35&branch=WIP%2Fall-
 stacked-in-the-right-order listed here from 55173bd to 63bbf0a]) committed
 (in order) ASAP
 - Implement a very very early communication plan for outreach to the
 extender community including publishing a Dev Note on Make Core (i.e. to
 give the extender community awareness and guidance on how to prepare their
 test suites)

 This plan will add PHPUnit 8 and 9 support to Core. Plus, it sets up the
 test suites to adopt future PHPUnit versions.

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Ticket URL: <https://core.trac.wordpress.org/ticket/46149#comment:59>
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