AssertProductInventoryMinAllowedQty.php

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

use Magento\Catalog\Test\Page\Product\CatalogProductView;
use Magento\Checkout\Test\Page\CheckoutCart;
use Magento\Mtf\Client\BrowserInterface;
use Magento\Mtf\Constraint\AbstractConstraint;
use Magento\Mtf\Fixture\FixtureInterface;

class AssertProductInventoryMinAllowedQty extends AbstractConstraint
{
    private $errorMessage = 'The fewest you may purchase is %s.';

    public function processAssert(
        BrowserInterface $browser,
        FixtureInterface $product,
        CatalogProductView $catalogProductView,
        CheckoutCart $checkoutCart,
        $minQty
    ) {
        // Ensure that shopping cart is empty
        $checkoutCart->open()->getCartBlock()->clearShoppingCart();

        $browser->open($_ENV['app_frontend_url'] . $product->getUrlKey() . '.html');
        $catalogProductView->getViewBlock()->waitLoader();
        $catalogProductView->getViewBlock()->setQtyAndClickAddToCart(1);
        \PHPUnit\Framework\Assert::assertEquals(
            $catalogProductView->getMessagesBlock()->getErrorMessage(),
            sprintf($this->errorMessage, $minQty),
            'The minimum purchase warning message is not appears.'
        );

        $catalogProductView->getViewBlock()->setQtyAndClickAddToCart($minQty);
        \PHPUnit\Framework\Assert::assertTrue(
            $catalogProductView->getMessagesBlock()->waitSuccessMessage(),
            'Limiting min qty is not working correctly.'
        );
    }

    public function toString()
    {
        return 'Limiting min qty is working correctly.';
    }
}