CompositeProductBatchSizeAdjusterTest.php

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<?php
namespace Magento\Catalog\Test\Unit\Model\ResourceModel\Product\Indexer\Price;

use Magento\Catalog\Model\ResourceModel\Product\Indexer\Price\CompositeProductBatchSizeAdjuster;
use Magento\Catalog\Model\ResourceModel\Product\Indexer\Price\CompositeProductRelationsCalculator;

class CompositeProductBatchSizeAdjusterTest extends \PHPUnit\Framework\TestCase
{
    private $model;

    private $relationsCalculatorMock;

    protected function setUp()
    {
        $this->relationsCalculatorMock = $this->getMockBuilder(CompositeProductRelationsCalculator::class)
            ->disableOriginalConstructor()
            ->getMock();
        $this->model = new CompositeProductBatchSizeAdjuster($this->relationsCalculatorMock);
    }

    public function testAdjust()
    {
        $this->relationsCalculatorMock->expects($this->once())
            ->method('getMaxRelationsCount')
            ->willReturn(200);
        $this->assertEquals(25, $this->model->adjust(5000));
    }
}