Issue #1848200 by yched: Fixed Random warnings in tests in field_ui().admin.inc.

core/modules/field/lib/Drupal/field/Plugin/Type/Formatter/FormatterPluginManager.php

@@ -22,8 +22,8 @@ class FormatterPluginManager extends PluginManagerBase {
    * Overrides Drupal\Component\Plugin\PluginManagerBase:$defaults.
    */
   protected $defaults = array(
+    'field_types' => array(),
     'settings' => array(),
-    'default_value' => TRUE,
   );
 
   /**

core/modules/field/lib/Drupal/field/Plugin/Type/Widget/WidgetPluginManager.php

@@ -22,6 +22,7 @@ class WidgetPluginManager extends PluginManagerBase {
    * Overrides Drupal\Component\Plugin\PluginManagerBase:$defaults.
    */
   protected $defaults = array(
+    'field_types' => array(),
     'settings' => array(),
     'multiple_values' => FALSE,
     'default_value' => TRUE,