ProductIdLocatorTest.php

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

class ProductIdLocatorTest extends \PHPUnit\Framework\TestCase
{
    private $metadataPool;

    private $collectionFactory;

    private $model;

    protected function setUp()
    {
        $this->metadataPool = $this->getMockBuilder(\Magento\Framework\EntityManager\MetadataPool::class)
            ->setMethods(['getMetadata'])
            ->disableOriginalConstructor()->getMock();
        $this->collectionFactory = $this
            ->getMockBuilder(\Magento\Catalog\Model\ResourceModel\Product\CollectionFactory::class)
            ->setMethods(['create'])
            ->disableOriginalConstructor()->getMock();

        $objectManager = new \Magento\Framework\TestFramework\Unit\Helper\ObjectManager($this);
        $this->model = $objectManager->getObject(
            \Magento\Catalog\Model\ProductIdLocator::class,
            [
                'metadataPool' => $this->metadataPool,
                'collectionFactory' => $this->collectionFactory,
            ]
        );
    }

    public function testRetrieveProductIdsBySkus()
    {
        $skus = ['sku_1', 'sku_2'];
        $collection = $this->getMockBuilder(\Magento\Catalog\Model\ResourceModel\Product\Collection::class)
            ->setMethods(['getIterator', 'addFieldToFilter'])
            ->disableOriginalConstructor()->getMock();
        $product = $this->getMockBuilder(\Magento\Catalog\Api\Data\ProductInterface::class)
            ->setMethods(['getSku', 'getData', 'getTypeId'])
            ->disableOriginalConstructor()->getMockForAbstractClass();
        $metaDataInterface = $this->getMockBuilder(\Magento\Framework\EntityManager\EntityMetadataInterface::class)
            ->setMethods(['getLinkField'])
            ->disableOriginalConstructor()->getMockForAbstractClass();
        $this->collectionFactory->expects($this->once())->method('create')->willReturn($collection);
        $collection->expects($this->once())->method('addFieldToFilter')
            ->with(\Magento\Catalog\Api\Data\ProductInterface::SKU, ['in' => $skus])->willReturnSelf();
        $collection->expects($this->once())->method('getIterator')->willReturn(new \ArrayIterator([$product]));
        $this->metadataPool
            ->expects($this->once())
            ->method('getMetadata')
            ->with(\Magento\Catalog\Api\Data\ProductInterface::class)
            ->willReturn($metaDataInterface);
        $metaDataInterface->expects($this->once())->method('getLinkField')->willReturn('entity_id');
        $product->expects($this->once())->method('getSku')->willReturn('sku_1');
        $product->expects($this->once())->method('getData')->with('entity_id')->willReturn(1);
        $product->expects($this->once())->method('getTypeId')->willReturn('simple');
        $this->assertEquals(
            ['sku_1' => [1 => 'simple']],
            $this->model->retrieveProductIdsBySkus($skus)
        );
    }
}