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Change records:
https://www.drupal.org/node/2998888
Problem/Motivation
Replace deprecated trait Drupal\field\Tests\EntityReference\EntityReferenceTestTrait
Proposed resolution
Use trait Drupal\Tests\field\Traits\EntityReferenceTestTrait
Comments
Comment #2
thallesFollow the patch!
Comment #3
thallesComment #4
thallesApparently this issue was fixed in another issue