AssertChildProductsInGrid.php

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

use Magento\Catalog\Test\Page\Adminhtml\CatalogProductIndex;
use Magento\ConfigurableProduct\Test\Fixture\ConfigurableProduct;
use Magento\Mtf\Constraint\AbstractConstraint;

class AssertChildProductsInGrid extends AbstractConstraint
{
    const NOT_VISIBLE_INDIVIDUALLY = 'Not Visible Individually';

    public function processAssert(CatalogProductIndex $productGrid, ConfigurableProduct $product)
    {
        $configurableAttributesData = $product->getConfigurableAttributesData();
        $errors = [];

        $productGrid->open();
        foreach ($configurableAttributesData['matrix'] as $variation) {
            $filter = [
                'name' => $variation['name'],
                'type' => (isset($variation['weight']) && (int)$variation['weight'] > 0)
                    ? 'Simple Product' : 'Virtual Product',
                'sku' => $variation['sku'],
                'visibility' => self::NOT_VISIBLE_INDIVIDUALLY,
            ];

            if (!$productGrid->getProductGrid()->isRowVisible($filter)) {
                $errors[] = sprintf(
                    'Child product with name: "%s" and sku:"%s" is absent in grid.',
                    $filter['name'],
                    $filter['sku']
                );
            }
        }

        \PHPUnit\Framework\Assert::assertEmpty($errors, implode(' ', $errors));
    }

    public function toString()
    {
        return 'Child products generated during configurable product are present in products grid.';
    }
}