AssertProductVisibleInCategory.php

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

use Magento\Catalog\Test\Fixture\Category;
use Magento\Catalog\Test\Page\Category\CatalogCategoryView;
use Magento\Cms\Test\Page\CmsIndex;
use Magento\Mtf\Constraint\AbstractConstraint;
use Magento\Mtf\Fixture\FixtureInterface;

class AssertProductVisibleInCategory extends AbstractConstraint
{
    protected $errorMessage = 'Product is absent on category page.';

    protected $successfulMessage = 'Product is visible in the assigned category.';

    public function processAssert(
        CatalogCategoryView $catalogCategoryView,
        CmsIndex $cmsIndex,
        FixtureInterface $product,
        Category $category = null
    ) {
        $categoryName = $product->hasData('category_ids') ? $product->getCategoryIds()[0] : $category->getName();
        $cmsIndex->open();
        $cmsIndex->getTopmenu()->selectCategoryByName($categoryName);

        $isProductVisible = $catalogCategoryView->getListProductBlock()->getProductItem($product)->isVisible();
        while (!$isProductVisible && $catalogCategoryView->getBottomToolbar()->nextPage()) {
            $isProductVisible = $catalogCategoryView->getListProductBlock()->getProductItem($product)->isVisible();
        }

        if (($product->getVisibility() === 'Search') || ($this->getStockStatus($product) === 'Out of Stock')) {
            $isProductVisible = !$isProductVisible;
            $this->errorMessage = 'Product found in this category.';
            $this->successfulMessage = 'Asserts that the product could not be found in this category.';
        }

        \PHPUnit\Framework\Assert::assertTrue(
            $isProductVisible,
            $this->errorMessage
        );
    }

    protected function getStockStatus(FixtureInterface $product)
    {
        $quantityAndStockStatus = $product->getQuantityAndStockStatus();
        return isset($quantityAndStockStatus['is_in_stock']) ? $quantityAndStockStatus['is_in_stock'] : null;
    }

    public function toString()
    {
        return $this->successfulMessage;
    }
}