RendererListTest.php

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<?php
namespace Magento\Framework\View\Test\Unit\Element;

class RendererListTest extends \PHPUnit\Framework\TestCase
{
    protected $renderList;

    protected $contextMock;

    protected $layoutMock;

    protected $blockMock;

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

        $this->blockMock = $this->getMockBuilder(\Magento\Framework\View\Element\AbstractBlock::class)
            ->setMethods(['setRenderedBlock', 'getTemplate', 'setTemplate'])->disableOriginalConstructor()
            ->getMockForAbstractClass();

        $this->layoutMock = $this->getMockBuilder(\Magento\Framework\View\LayoutInterface::class)
            ->setMethods(['getBlock', 'getChildName'])->disableOriginalConstructor()->getMockForAbstractClass();

        $this->layoutMock->expects($this->any())
            ->method('getBlock')
            ->will($this->returnValue($this->blockMock));

        $this->contextMock = $this->getMockBuilder(\Magento\Framework\View\Element\Context::class)
            ->setMethods(['getLayout'])->disableOriginalConstructor()->getMock();

        $this->contextMock->expects($this->any())
            ->method('getLayout')
            ->will($this->returnValue($this->layoutMock));

        $this->renderList = $objectManagerHelper->getObject(
            \Magento\Framework\View\Element\RendererList::class,
            ['context' => $this->contextMock]
        );
    }

    public function testGetRenderer()
    {
        $this->blockMock->expects($this->any())
            ->method('setRenderedBlock')
            ->will($this->returnValue($this->blockMock));

        $this->blockMock->expects($this->any())
            ->method('getTemplate')
            ->will($this->returnValue('template'));

        $this->blockMock->expects($this->any())
            ->method('setTemplate')
            ->will($this->returnValue($this->blockMock));

        $this->layoutMock->expects($this->any())
            ->method('getChildName')
            ->will($this->returnValue(true));

        $this->assertInstanceOf(
            \Magento\Framework\View\Element\BlockInterface::class,
            $this->renderList->getRenderer('type', null, null)
        );
        $this->assertInstanceOf(
            \Magento\Framework\View\Element\BlockInterface::class,
            $this->renderList->getRenderer('type', null, 'renderer_template')
        );
    }

    public function testGetRendererWithException()
    {
        $this->assertInstanceOf(
            \Magento\Framework\View\Element\BlockInterface::class,
            $this->renderList->getRenderer(null)
        );
    }
}