ComparedTest.php

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<?php
namespace Magento\Reports\Test\Unit\Block\Product;

use \Magento\Reports\Block\Product\Compared;
use \Magento\Reports\Model\Product\Index\Factory;

class ComparedTest extends \PHPUnit\Framework\TestCase
{

    private $sut;

    private $factoryMock;

    protected function setUp()
    {
        $contextMock = $this->getMockBuilder(\Magento\Catalog\Block\Product\Context::class)
            ->disableOriginalConstructor()
            ->getMock();

        $visibilityMock = $this->getMockBuilder(\Magento\Catalog\Model\Product\Visibility::class)
            ->disableOriginalConstructor()
            ->getMock();

        $this->factoryMock = $this->getMockBuilder(Factory::class)
            ->disableOriginalConstructor()
            ->setMethods(['get'])
            ->getMock();

        $this->sut = new Compared($contextMock, $visibilityMock, $this->factoryMock);
    }

    public function testGetModelException()
    {
        $this->factoryMock->expects($this->once())->method('get')->willThrowException(new \InvalidArgumentException);

        $this->sut->getModel();
    }

    public function testGetModel()
    {
        $indexMock = $this->getMockBuilder(\Magento\Reports\Model\Product\Index\AbstractIndex::class)
            ->disableOriginalConstructor()
            ->getMock();

        $this->factoryMock->expects($this->once())->method('get')->willReturn($indexMock);

        $this->assertSame($indexMock, $this->sut->getModel());
    }
}