@GetMapping
    public Product findProduct(@ModelAttribute("product") Product product) {
        return product;
    }
@Test
    void findProduct_ReturnsProduct() {
        // given
        var product = new Product(1, "Название товара", "Описание товара");

        // when
        var result = this.controller.findProduct(product);

        // then
        assertEquals(product, result);
    }