test.php

/**
 * Class ShoppingCartTest
 *
 * @package ShoppingCart\test\Entity
 */
class ShoppingCartTest extends \PHPUnit_Framework_TestCase
{
    /**
     * @dataProvider productProvider
     */
    public function testAdd($productArr)
    {
        $ShoppingCart = new ShoppingCart($this->mockTransitory($productArr));

        foreach ($productArr as $item) {
            $ShoppingCart->add($item['product'], $item['quantity']);
        }

        foreach ($productArr as $item) {
            $this->assertEquals($item['quantity'], $ShoppingCart->quantityByItem($item['product']));
        }
    }
    
    public function productProvider()
    {
        return [
            [
                [
                    [
                        'product' => $this->productFactory(0),
                        'quantity' => 10,
                    ],
                    [
                        'product' => $this->productFactory(1),
                        'quantity' => 6
                    ],
                ],
            ]
        ];
    }

    private function productFactory($index)
    {
        $productArr[] =
                new Product(
                );

        $productArr[] =
            new Product(
            );

        return $productArr[$index];
    }