Change record status: 
Project: 
Introduced in branch: 
8.6.x
Introduced in version: 
8.6.0
Description: 

All REST and HAL tests to moved to target modules. All *TestBase classes from previous locations are deprecated.

Example

Before: Drupal\Tests\hal\Functional\EntityResource\Feed\FeedResourceTestBase;
After: Drupal\Tests\aggregator\Functional\Hal\FeedResourceTestBase;

See more in #2910883: Move all entity type REST tests to the providing modules

Impacts: 
Module developers