Fix tests
Fix 'PHP Fatal error: Class Drupal\Tests\eck\Unit\TestDoubles\FieldTypePluginManagerDummy contains 2 abstract methods and must therefore be declared abstract or implement the remaining methods'
Related to #3422726
Fix 'PHP Fatal error: Class Drupal\Tests\eck\Unit\TestDoubles\FieldTypePluginManagerDummy contains 2 abstract methods and must therefore be declared abstract or implement the remaining methods'
Related to #3422726