GetBlockByIdentifierTest.php

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<?php
namespace Magento\Cms\Test\Unit\Model;

use Magento\Cms\Model\GetBlockByIdentifier;

class GetBlockByIdentifierTest extends \PHPUnit\Framework\TestCase
{
    private $getBlockByIdentifierCommand;

    private $block;

    private $blockFactory;

    private $blockResource;

    protected function setUp()
    {
        $this->blockFactory = $this->getMockBuilder(\Magento\Cms\Model\BlockFactory::class)
            ->disableOriginalConstructor()
            ->setMethods(['create'])
            ->getMock();

        $this->blockResource = $this->getMockBuilder(\Magento\Cms\Model\ResourceModel\Block::class)
            ->disableOriginalConstructor()
            ->getMock();

        $this->block = $this->getMockBuilder(\Magento\Cms\Model\Block::class)
            ->disableOriginalConstructor()
            ->setMethods(['setStoreId', 'getId'])
            ->getMock();

        $this->getBlockByIdentifierCommand = new GetBlockByIdentifier($this->blockFactory, $this->blockResource);
    }

    public function testGetByIdentifier()
    {
        $identifier = 'banner';
        $storeId = 0;

        $this->blockFactory->expects($this->once())
            ->method('create')
            ->willReturn($this->block);

        $this->block->expects($this->once())
            ->method('setStoreId')
            ->willReturn($this->block);

        $this->block->expects($this->once())
            ->method('getId')
            ->willReturn(1);

        $this->blockResource->expects($this->once())
            ->method('load')
            ->with($this->block, $identifier)
            ->willReturn($this->block);

        $this->getBlockByIdentifierCommand->execute($identifier, $storeId);
    }
}