public void AcceptTest()
{
var offer = new MaterialType[] { MaterialType.Brick, MaterialType.Brick };
var request = new MaterialType[] { MaterialType.Wool, MaterialType.Grain };
var offeredMaterials = offer.Select(m => new RawMaterial(m)).ToArray();
var requestedMaterrials = request.Select(m => new RawMaterial(m)).ToArray();
var player1 = new Mock<IPlayer>();
player1.Setup(p => p.HasResources(offer)).Returns(true);
player1.Setup(p => p.TakeResources(offer)).Returns(offeredMaterials);
var player2 = new Mock<IPlayer>();
player2.Setup(p => p.HasResources(request)).Returns(true);
player2.Setup(p => p.TakeResources(request)).Returns(requestedMaterrials);
var trade = new Trade(offer, request, player1.Object);
trade.Accept(player2.Object);
player1.Verify(p => p.TakeResources(offer), Times.Once);
player2.Verify(p => p.TakeResources(request), Times.Once);
player1.Verify(p => p.AddResources(requestedMaterrials), Times.Once);
player2.Verify(p => p.AddResources(offeredMaterials), Times.Once);
Assert.Equal(TradeState.Processed, trade.State);
}