public void testGetProductDisplayNames() { final Product product1 = new Product("name", "t", 1, 1); final Product product2 = new Product("name", "t", 1, 1); final Product product3 = new Product("name", "t", 1, 1); _productManager.addProduct(product1); _productManager.addProduct(product2); _productManager.addProduct(product3); String[] names = _productManager.getProductDisplayNames(); assertEquals(3, names.length); assertEquals("[1] name", names[0]); assertEquals("[2] name", names[1]); assertEquals("[3] name", names[2]); }