Change record status: 
Project: 
Introduced in branch: 
8.4.x
Introduced in version: 
8.4.1
Description: 

As part of the PHPUnit Initiative the tests in the Config module have been converted to use PHPUnit.

\Drupal\config\Tests\AssertConfigEntityImportTrait has been deprecated. Test classes that use this trait should be changed to use
\Drupal\Tests\config\Traits\AssertConfigEntityImportTrait instead.

Impacts: 
Module developers