ChangeTemplateObserverTest.php

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<?php
namespace Magento\ProductVideo\Test\Unit\Observer;

use \Magento\Framework\TestFramework\Unit\Helper\ObjectManager;

class ChangeTemplateObserverTest extends \PHPUnit\Framework\TestCase
{
    public function testChangeTemplate()
    {
        $observer = $this->createPartialMock(\Magento\Framework\Event\Observer::class, ['getBlock']);

        $block = $this->createMock(\Magento\ProductVideo\Block\Adminhtml\Product\Edit\NewVideo::class);
        $block->expects($this->once())
            ->method('setTemplate')
            ->with('Magento_ProductVideo::helper/gallery.phtml')
            ->willReturnSelf();
        $observer->expects($this->once())->method('getBlock')->willReturn($block);

        $this->objectManager = new ObjectManager($this);
        $unit = $this->objectManager->getObject(\Magento\ProductVideo\Observer\ChangeTemplateObserver::class);
        $unit->execute($observer);
    }
}