SummaryTest.php

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

use \Magento\Checkout\Model\Config\Source\Cart\Summary;

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

    protected function setUp()
    {
        $this->model = new Summary();
    }

    public function testToOptionArray()
    {
        $expectedResult = [
            ['value' => 0, 'label' => __('Display number of items in cart')],
            ['value' => 1, 'label' => __('Display item quantities')],
        ];
        $this->assertEquals($expectedResult, $this->model->toOptionArray());
    }
}