yii2/tests/framework/base/EventTest.php

<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yiiunit\framework\base;

use yii\base\Component;
use yii\base\Event;
use yiiunit\TestCase;

/**
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @since 2.0
 */
class EventTest extends TestCase
{
    public $counter;

    public function setUp()
    {
        $this->counter = 0;
        Event::off(ActiveRecord::className(), 'save');
        Event::off(Post::className(), 'save');
        Event::off(User::className(), 'save');
    }

    public function testOn()
    {
        Event::on(Post::className(), 'save', function ($event) {
            $this->counter += 1;
        });
        Event::on(ActiveRecord::className(), 'save', function ($event) {
            $this->counter += 3;
        });
        $this->assertEquals(0, $this->counter);
        $post = new Post;
        $post->save();
        $this->assertEquals(4, $this->counter);
        $user = new User;
        $user->save();
        $this->assertEquals(7, $this->counter);
    }

    public function testOff()
    {
        $handler = function ($event) {
            $this->counter ++;
        };
        $this->assertFalse(Event::hasHandlers(Post::className(), 'save'));
        Event::on(Post::className(), 'save', $handler);
        $this->assertTrue(Event::hasHandlers(Post::className(), 'save'));
        Event::off(Post::className(), 'save', $handler);
        $this->assertFalse(Event::hasHandlers(Post::className(), 'save'));
    }

    public function testHasHandlers()
    {
        $this->assertFalse(Event::hasHandlers(Post::className(), 'save'));
        $this->assertFalse(Event::hasHandlers(ActiveRecord::className(), 'save'));
        Event::on(Post::className(), 'save', function ($event) {
            $this->counter += 1;
        });
        $this->assertTrue(Event::hasHandlers(Post::className(), 'save'));
        $this->assertFalse(Event::hasHandlers(ActiveRecord::className(), 'save'));

        $this->assertFalse(Event::hasHandlers(User::className(), 'save'));
        Event::on(ActiveRecord::className(), 'save', function ($event) {
            $this->counter += 1;
        });
        $this->assertTrue(Event::hasHandlers(User::className(), 'save'));
        $this->assertTrue(Event::hasHandlers(ActiveRecord::className(), 'save'));
    }
}

class ActiveRecord extends Component
{
    public function save()
    {
        $this->trigger('save');
    }
}

class Post extends ActiveRecord
{
}

class User extends ActiveRecord
{
}