GridPerPageTest.php

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

use Magento\Framework\TestFramework\Unit\Helper\ObjectManager;

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

    protected function setUp()
    {
        $helper = new ObjectManager($this);
        $this->model = $helper->getObject(
            \Magento\Catalog\Model\Config\Source\GridPerPage::class,
            ['perPageValues' => 'some,values']
        );
    }

    public function testToOptionalArray()
    {
        $expect = [
            ['value' => 'some', 'label' => 'some'],
            ['value' => 'values', 'label' => 'values'],
        ];

        $this->assertEquals($expect, $this->model->toOptionArray());
    }
}