`Captcha` references removed from unit tests

framework/validators/Validator.php

@@ -10,7 +10,6 @@ namespace yii\validators;
 use Yii;
 use yii\base\Component;
 use yii\base\NotSupportedException;
-use yii\captcha\CaptchaValidator;
 
 /**
  * Validator is the base class for all validators.
@@ -23,7 +22,6 @@ use yii\captcha\CaptchaValidator;
  * be referenced using short names. They are listed as follows:
  *
  * - `boolean`: [[BooleanValidator]]
- * - `captcha`: [[\yii\captcha\CaptchaValidator]]
  * - `compare`: [[CompareValidator]]
  * - `date`: [[DateValidator]]
  * - `datetime`: [[DateValidator]]
@@ -61,7 +59,6 @@ class Validator extends Component
      */
     public static $builtInValidators = [
         'boolean' => BooleanValidator::class,
-        'captcha' => CaptchaValidator::class,
         'compare' => CompareValidator::class,
         'date' => DateValidator::class,
         'datetime' => [

tests/data/base/Singer.php

@@ -23,7 +23,7 @@ class Singer extends Model
         return [
             [['lastName'], 'default', 'value' => 'Lennon'],
             [['lastName'], 'required'],
-            [['underscore_style'], 'yii\captcha\CaptchaValidator'],
+            [['underscore_style'], 'safe'],
             [['test'], 'required', 'when' => function ($model) { return $model->firstName === 'cebe'; }],
         ];
     }

tests/framework/di/ServiceLocatorTest.php

@@ -9,6 +9,7 @@ namespace yiiunit\framework\di;
 
 use yii\base\BaseObject;
 use yii\di\ServiceLocator;
+use yii\widgets\InputWidget;
 use yiiunit\TestCase;
 
 class Creator
@@ -96,7 +97,7 @@ class ServiceLocatorTest extends TestCase
             'components' => [
                 'captcha' => [
                     'name' => 'foo bar',
-                    'class' => 'yii\captcha\Captcha',
+                    'class' => InputWidget::class,
                 ],
             ],
         ];