public void NoNeighborsAreAliveIfEmptyUniverse()
{
var stateHolder = new Mock<IStateHolder>();
stateHolder.Setup(sh => sh.GetState(It.IsAny<IPosition>())).Returns(new Dead());
var position = new CartesianPosition(0, 0);
var count = position.CountAliveNeighbors(stateHolder.Object);
Assert.Equal(new AliveNeighborsCount(0), count);
}
public void AsksTheUniverseForAliveNeighborsCount()
{
var stateHolder = new Mock<IStateHolder>();
stateHolder.Setup(sh => sh.GetState(It.IsAny<IPosition>())).Returns(new Alive());
var position = new CartesianPosition(0,0);
var count = position.CountAliveNeighbors(stateHolder.Object);
stateHolder.Verify(sh => sh.GetState(new CartesianPosition(-1, -1)));
stateHolder.Verify(sh => sh.GetState(new CartesianPosition(-1, 0)));
stateHolder.Verify(sh => sh.GetState(new CartesianPosition(-1, 1)));
stateHolder.Verify(sh => sh.GetState(new CartesianPosition(0, -1)));
stateHolder.Verify(sh => sh.GetState(new CartesianPosition(0, 1)));
stateHolder.Verify(sh => sh.GetState(new CartesianPosition(1, -1)));
stateHolder.Verify(sh => sh.GetState(new CartesianPosition(1, 0)));
stateHolder.Verify(sh => sh.GetState(new CartesianPosition(1, 1)));
Assert.Equal(new AliveNeighborsCount(8), count);
}