private void AssertOffer(TradeOffer actual, TradeOffer expectedOffer)
{
actual.Should().NotBeNull();
actual.Id.Should().BeGreaterThan(0);
actual.TradePointId.Should().Be(expectedOffer.TradePointId);
actual.CommodityId.Should().Be(expectedOffer.CommodityId);
actual.PricePerUnit.Should().Be(expectedOffer.PricePerUnit);
actual.Trader.Should().BeEquivalentTo(expectedOffer.Trader);
actual.OfferType.Should().Be(expectedOffer.OfferType);
}