public void Edit_Valid_AnticipatedPrice_Test() { var price = new Price { CurrentValue = 20, Timestamp = new DateTime(2019, 1, 1, 20, 0, 0), PriceHistoryFuture = new List <PriceHistory>(), PriceHistoryPast = new List <PriceHistory>() }; var newPrice = 21; var timestamp = DateTime.Now.Add(TimeSpan.FromSeconds(1)); Assert.True(price.AddAnticipatedPrice(newPrice, timestamp)); }