public void GetOrderDetailByProductId_ValidId_ReturnsOrderDateUnitPriceAndQuantity()
{
using var db = new NorthwindContext();
OrderDetailsRepository service = new OrderDetailsRepository(db);
var orderDetails = service.GetByProductId(11).ToList();
Assert.Equal(38, orderDetails.Count);
Assert.Equal("1997-05-06", orderDetails.First().Order.Date.ToString("yyyy-MM-dd"));
Assert.Equal(21, orderDetails.First().UnitPrice);
Assert.Equal(3, orderDetails.First().Quantity);
}