DefaultItemsTest.php

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<?php
namespace Magento\Sales\Test\Unit\Block\Order\Email\Items;

class DefaultItemsTest extends \PHPUnit\Framework\TestCase
{
    protected $block;

    protected $priceRenderBlock;

    protected $layoutMock;

    protected $objectManager;

    protected $itemMock;

    protected function setUp()
    {
        $this->objectManager = new \Magento\Framework\TestFramework\Unit\Helper\ObjectManager($this);

        $this->layoutMock = $this->getMockBuilder(\Magento\Framework\View\Layout::class)
            ->disableOriginalConstructor()
            ->setMethods(['getBlock'])
            ->getMock();

        $this->block = $this->objectManager->getObject(
            \Magento\Sales\Block\Order\Email\Items\DefaultItems::class,
            [
                'context' => $this->objectManager->getObject(
                    \Magento\Backend\Block\Template\Context::class,
                    ['layout' => $this->layoutMock]
                )
            ]
        );

        $this->priceRenderBlock = $this->getMockBuilder(\Magento\Backend\Block\Template::class)
            ->disableOriginalConstructor()
            ->setMethods(['setItem', 'toHtml'])
            ->getMock();

        $this->itemMock = $this->getMockBuilder(\Magento\Sales\Model\Order\Item::class)
            ->disableOriginalConstructor()
            ->setMethods(['__wakeup'])
            ->getMock();
    }

    public function testGetItemPrice()
    {
        $html = '$34.28';

        $this->layoutMock->expects($this->once())
            ->method('getBlock')
            ->with('item_price')
            ->will($this->returnValue($this->priceRenderBlock));

        $this->priceRenderBlock->expects($this->once())
            ->method('setItem')
            ->with($this->itemMock);

        $this->priceRenderBlock->expects($this->once())
            ->method('toHtml')
            ->will($this->returnValue($html));

        $this->assertEquals($html, $this->block->getItemPrice($this->itemMock));
    }
}