SkuProcessorTest.php

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<?php
namespace Magento\CatalogImportExport\Test\Unit\Model\Import\Product;

use Magento\CatalogImportExport\Model\Import\Product\SkuProcessor as SkuProcessor;

class SkuProcessorTest extends \PHPUnit\Framework\TestCase
{
    protected $productFactory;

    protected $skuProcessor;

    protected function setUp()
    {
        $this->productFactory = $this->createMock(\Magento\Catalog\Model\ProductFactory::class);
        $this->skuProcessor = $this->getMockBuilder(
            \Magento\CatalogImportExport\Model\Import\Product\SkuProcessor::class
        )
            ->setMethods(['_getSkus'])
            ->setConstructorArgs([$this->productFactory])
            ->getMock();
    }

    public function testReloadOldSkus()
    {
        $skuValue = 'value';

        $this->skuProcessor
            ->expects($this->once())
            ->method('_getSkus')
            ->willReturn($skuValue);

        $this->skuProcessor->reloadOldSkus();
        $oldSkus = $this->getPropertyValue($this->skuProcessor, 'oldSkus');

        $this->assertEquals($skuValue, $oldSkus);
    }

    public function testGetOldSkusIfNotSet()
    {
        $expectedOldSkus = 'value';
        $this->setPropertyValue($this->skuProcessor, 'oldSkus', null);
        $this->skuProcessor
            ->expects($this->once())
            ->method('_getSkus')
            ->willReturn($expectedOldSkus);

        $result = $this->skuProcessor->getOldSkus();

        $this->assertEquals($expectedOldSkus, $result);
    }

    public function testGetOldSkusIfSet()
    {
        $expectedOldSkus = 'value';
        $this->setPropertyValue($this->skuProcessor, 'oldSkus', 'value');
        $this->skuProcessor
            ->expects($this->never())
            ->method('_getSkus');

        $result = $this->skuProcessor->getOldSkus();

        $this->assertEquals($expectedOldSkus, $result);
    }

    protected function setPropertyValue(&$object, $property, $value)
    {
        $reflection = new \ReflectionClass(get_class($object));
        $reflectionProperty = $reflection->getProperty($property);
        $reflectionProperty->setAccessible(true);
        $reflectionProperty->setValue($object, $value);

        return $object;
    }

    protected function getPropertyValue(&$object, $property)
    {
        $reflection = new \ReflectionClass(get_class($object));
        $reflectionProperty = $reflection->getProperty($property);
        $reflectionProperty->setAccessible(true);

        return $reflectionProperty->getValue($object);
    }
}