CheckoutSummaryConfigProviderTest.php

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

use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Framework\UrlInterface;
use Magento\Checkout\Model\Cart\CheckoutSummaryConfigProvider;
use Magento\Store\Model\ScopeInterface;

class CheckoutSummaryConfigProviderTest extends \PHPUnit\Framework\TestCase
{
    private $urlBuilderMock;

    private $scopeConfigMock;

    private $model;

    protected function setUp()
    {
        $this->urlBuilderMock = $this->getMockBuilder(UrlInterface::class)->getMock();
        $this->scopeConfigMock = $this->getMockBuilder(ScopeConfigInterface::class)->getMock();
        $this->model = new CheckoutSummaryConfigProvider($this->urlBuilderMock, $this->scopeConfigMock);
    }

    public function testGetConfig()
    {
        $maxItemsCount = 10;
        $cartUrl = 'url/to/cart/page';
        $expectedResult = [
            'maxCartItemsToDisplay' => $maxItemsCount,
            'cartUrl' => $cartUrl
        ];

        $this->urlBuilderMock->expects($this->once())->method('getUrl')->with('checkout/cart')->willReturn($cartUrl);
        $this->scopeConfigMock->expects($this->once())
            ->method('getValue')
            ->with('checkout/options/max_items_display_count', ScopeInterface::SCOPE_STORE)
            ->willReturn($maxItemsCount);

        $this->assertEquals($expectedResult, $this->model->getConfig());
    }
}