Change record status: 
Project: 
Introduced in branch: 
8.4.x
Introduced in version: 
8.4.0-beta2
Description: 

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

As a part of this \Drupal\block\Tests\BlockTestBase has been deprecated. All test classes that extend this base class should be converted to use \Drupal\Tests\block\Functional\BlockTestBase instead.

Impacts: 
Module developers