EventManagerTest.php

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<?php
namespace Magento\Test;

class EventManagerTest extends \PHPUnit\Framework\TestCase
{
    protected $_eventManager;

    protected $_subscriberOne;

    protected $_subscriberTwo;

    protected function setUp()
    {
        $this->_subscriberOne = $this->createPartialMock(\stdClass::class, ['testEvent']);
        $this->_subscriberTwo = $this->createPartialMock(\stdClass::class, ['testEvent']);
        $this->_eventManager = new \Magento\TestFramework\EventManager(
            [$this->_subscriberOne, $this->_subscriberTwo]
        );
    }

    public function testFireEvent($reverseOrder, $expectedSubscribers)
    {
        $actualSubscribers = [];
        $callback = function () use (&$actualSubscribers) {
            $actualSubscribers[] = 'subscriberOne';
        };
        $this->_subscriberOne->expects($this->once())->method('testEvent')->will($this->returnCallback($callback));
        $callback = function () use (&$actualSubscribers) {
            $actualSubscribers[] = 'subscriberTwo';
        };
        $this->_subscriberTwo->expects($this->once())->method('testEvent')->will($this->returnCallback($callback));
        $this->_eventManager->fireEvent('testEvent', [], $reverseOrder);
        $this->assertEquals($expectedSubscribers, $actualSubscribers);
    }

    public function fireEventDataProvider()
    {
        return [
            'straight order' => [false, ['subscriberOne', 'subscriberTwo']],
            'reverse order' => [true, ['subscriberTwo', 'subscriberOne']]
        ];
    }

    public function testFireEventParameters()
    {
        $paramOne = 123;
        $paramTwo = 456;
        $this->_subscriberOne->expects($this->once())->method('testEvent')->with($paramOne, $paramTwo);
        $this->_subscriberTwo->expects($this->once())->method('testEvent')->with($paramOne, $paramTwo);
        $this->_eventManager->fireEvent('testEvent', [$paramOne, $paramTwo]);
    }
}