public void Should_ReturnNull_When_OutOfBoundsCellRetrieved()
{
// Arrange
Generation generation = new Generation(universeSize: 2);
// Act
Cell cell = generation.GetCell(row: 3, column: 3);
// Assert
Assert.IsNull(cell);
}
public void Should_MakeCellAlive_When_DeadCellToggled()
{
// Arrange
Generation initialGeneration = new Generation(universeSize: 2);
// Act
initialGeneration.ToggleCellLife(0, 0);
// Assert
Assert.AreEqual(initialGeneration.GetCell(0, 0).Alive, true);
}
public void Should_LetCellLive_When_CellHassTwoOrThreeLiveNeighbours()
{
// Arrange
Generation initialGeneration = new Generation(universeSize: 5);
initialGeneration.ToggleCellLife(0, 0);
initialGeneration.ToggleCellLife(0, 1);
initialGeneration.ToggleCellLife(0, 2);
// Act
EvolutionEngine engine = new EvolutionEngine(initialGeneration);
engine.EvolveGeneration();
// Assert
Assert.AreEqual(initialGeneration.GetCell(0, 1).Alive, true);
}
public void Should_KillCell_When_CellHasFewerThanTwoNeighbors()
{
// Arrange
Generation initialGeneration = new Generation(universeSize: 5);
initialGeneration.ToggleCellLife(0, 0);
initialGeneration.ToggleCellLife(0, 1);
// Act
EvolutionEngine engine = new EvolutionEngine(initialGeneration);
engine.EvolveGeneration();
// Assert
Assert.AreEqual(initialGeneration.GetCell(0, 0).Alive, false);
Assert.AreEqual(initialGeneration.GetCell(0, 1).Alive, false);
}
public void Should_SetAllCellsToDead_When_Initialised()
{
// Arrange
Generation generation;
// Act
generation = new Generation(universeSize: 5);
// Assert
for (int row = 0; row < generation.UniverseSize; row++)
{
for (int column = 0; column < generation.UniverseSize; column++)
{
Assert.AreEqual(generation.GetCell(row, column).Alive, false);
}
}
}
/// <summary>
/// Initialises a new instance of the LifeEngine with a specified initial generation.
/// </summary>
/// <param name="initialGeneration">The initial generation to start from.</param>
public EvolutionEngine(Generation initialGeneration)
{
CurrentGeneration = initialGeneration;
CurrentGenerationNumber = 1;
}
/// <summary>
/// Gets the number of neighbor cells that are alive for a particular cell.
/// </summary>
/// <param name="generation">The generation.</param>
/// <param name="cell">The cell whose living neighbour are being counted.</param>
/// <returns>Number of alive neighbours for the specified cell.</returns>
private int GetNumberOfAliveNeighbors(Generation generation, Cell cell)
{
int numberOfAliveNeighbours = 0;
List<Cell> neighboringCells = new List<Cell>
{
generation.GetCell(cell.Row - 1, cell.Column - 1),
generation.GetCell(cell.Row - 1, cell.Column + 1),
generation.GetCell(cell.Row, cell.Column + 1),
generation.GetCell(cell.Row + 1, cell.Column + 1),
generation.GetCell(cell.Row + 1, cell.Column),
generation.GetCell(cell.Row + 1, cell.Column - 1),
generation.GetCell(cell.Row, cell.Column - 1),
generation.GetCell(cell.Row - 1, cell.Column)
};
neighboringCells.ForEach(
neighboringCell => numberOfAliveNeighbours +=
(neighboringCell != null && neighboringCell.Alive) ? 1 : 0
);
return numberOfAliveNeighbours;
}