WrapperFactoryTest.php

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<?php
namespace Magento\Framework\Event\Test\Unit;

use \Magento\Framework\Event\WrapperFactory;

class WrapperFactoryTest extends \PHPUnit\Framework\TestCase
{
    public function testCreate()
    {
        $expectedInstance = \Magento\Framework\Event\Observer::class;
        $objectManagerMock = $this->createMock(\Magento\Framework\ObjectManagerInterface::class);

        $wrapperFactory = new WrapperFactory($objectManagerMock);
        $arguments = ['argument' => 'value', 'data' => 'data'];
        $observerInstanceMock = $this->createMock($expectedInstance);

        $objectManagerMock->expects($this->once())
            ->method('create')
            ->with($expectedInstance, $arguments)
            ->will($this->returnValue($observerInstanceMock));

        $this->assertInstanceOf($expectedInstance, $wrapperFactory->create($arguments));
    }
}