By lendude on
Change record status: 
Published (View all published change records)
Project: 
Drupal core
Introduced in branch: 
8.4.x
Introduced in version: 
8.4.0
Issue links: 
https://www.drupal.org/node/2863318
Description: 

As part of the PHPUnit Initiative \Drupal\system\Tests\Cache\AssertPageCacheContextsAndTagsTrait is deprecated in favour of \Drupal\Tests\system\Functional\Cache\AssertPageCacheContextsAndTagsTrait.

Tests based on WebTestBase should continue to use \Drupal\system\Tests\Cache\AssertPageCacheContextsAndTagsTrait. When converting or writing tests to use BrowserTestBase \Drupal\Tests\system\Functional\Cache\AssertPageCacheContextsAndTagsTrait should be used.

Impacts: 
Module developers