AssertProductComparePage.php

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<?php
namespace Magento\Catalog\Test\Constraint;

use Magento\Catalog\Test\Page\Product\CatalogProductCompare;
use Magento\Cms\Test\Page\CmsIndex;
use Magento\Mtf\Constraint\AbstractConstraint;

class AssertProductComparePage extends AbstractConstraint
{
    private $priceFormat = 2;

    protected $attributeProduct = [
        'name',
        'price',
        'sku' => 'SKU',
        'description' => 'Description',
        'short_description' => 'Short Description',
    ];

    public function processAssert(
        array $products,
        CatalogProductCompare $comparePage,
        CmsIndex $cmsIndex
    ) {
        $cmsIndex->open();
        $cmsIndex->getLinksBlock()->openLink("Compare Products");
        foreach ($products as $key => $product) {
            foreach ($this->attributeProduct as $attributeKey => $attribute) {
                $value = $attribute;
                $attribute = is_numeric($attributeKey) ? $attribute : $attributeKey;

                $expectedAttributeValue = $attribute != 'price'
                    ? ($product->hasData($attribute)
                        ? $product->getData($attribute)
                        : 'N/A')
                    : ($product->getDataFieldConfig('price')['source']->getPriceData() !== null
                        ? $product->getDataFieldConfig('price')['source']->getPriceData()['compare_price']
                        : number_format($product->getPrice(), $this->priceFormat));

                $attribute = is_numeric($attributeKey) ? 'info' : 'attribute';
                $attribute = ucfirst($attribute);
                $actualAttributeValue =
                    $comparePage->getCompareProductsBlock()->{'getProduct' . $attribute}($key + 1, $value);

                \PHPUnit\Framework\Assert::assertEquals(
                    $expectedAttributeValue,
                    $actualAttributeValue,
                    'Product "' . $product->getName() . '" has "' . $attribute . '" value different from fixture one.'
                );
            }
        }
    }

    public function toString()
    {
        return '"Compare Product" page has valid data for all products.';
    }
}