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);
}
public void FourAliveCellsStayAlive()
{
var p00 = new CartesianPosition(0, 0);
var p01 = new CartesianPosition(0, 1);
var p11 = new CartesianPosition(1, 1);
var p10 = new CartesianPosition(1, 0);
var stateHolder = new StateHolder();
stateHolder.SetState(p00, new Alive());
stateHolder.SetState(p01, new Alive());
stateHolder.SetState(p11, new Alive());
stateHolder.SetState(p10, new Alive());
var engine = new Engine<CartesianPosition>(stateHolder, new CartesianSpaceLimits());
var secondGeneration = engine.NextGeneration();
Assert.Equal(new Alive(), stateHolder.GetState(p00));
Assert.Equal(new Alive(), stateHolder.GetState(p01));
Assert.Equal(new Alive(), stateHolder.GetState(p11));
Assert.Equal(new Alive(), stateHolder.GetState(p10));
}
public void ThreeAliveCellsRotate()
{
var p11 = new CartesianPosition(1, 1);
var p12 = new CartesianPosition(1, 2);
var p13 = new CartesianPosition(1, 3);
var stateHolder = new StateHolder();
stateHolder.SetState(p11, new Alive());
stateHolder.SetState(p12, new Alive());
stateHolder.SetState(p13, new Alive());
var engine = new Engine<CartesianPosition>(stateHolder, new CartesianSpaceLimits());
var secondGeneration = engine.NextGeneration();
Assert.Equal(new Dead(), secondGeneration.GetState(p11));
Assert.Equal(new Alive(), secondGeneration.GetState(p12));
Assert.Equal(new Dead(), secondGeneration.GetState(p13));
var thirdGeneration = engine.NextGeneration();
Assert.Equal(new Alive(), thirdGeneration.GetState(p11));
Assert.Equal(new Alive(), thirdGeneration.GetState(p12));
Assert.Equal(new Alive(), thirdGeneration.GetState(p13));
}