public void DiagonalDownEnumerator_InitialState_InvalidUntilMoveNextCalled()
{
var board = new Board(5, 5);
var sut = new DiagonalDownEnumerator(board, 1, 1);
Assert.Throws<IndexOutOfRangeException>(() => { var location = sut.Current; });
sut.MoveNext();
Assert.DoesNotThrow(() => { var location = sut.Current; });
}
public void DiagonalDownEnumerator_MoveNext_ReturnsTheExpectedLocation()
{
var board = new Board(5, 5);
board[0, 0].Occupied = Occupied.Red;
board[1, 1].Occupied = Occupied.Yellow;
board[2, 2].Occupied = Occupied.Red;
var sut = new DiagonalDownEnumerator(board, 1, 1);
sut.MoveNext();
sut.Current.Occupied.ShouldBe(Occupied.Red);
sut.MoveNext();
sut.Current.Occupied.ShouldBe(Occupied.Yellow);
sut.MoveNext();
sut.Current.Occupied.ShouldBe(Occupied.Red);
}
public void DiagonalDownEnumerator_MoveNext_ReturnsFalseAtEndOfDiagonal()
{
var board = new Board(5, 5);
board[0, 0].Occupied = Occupied.Red;
board[1, 1].Occupied = Occupied.Yellow;
board[2, 2].Occupied = Occupied.Red;
var sut = new DiagonalDownEnumerator(board, 1, 1);
sut.MoveNext().ShouldBe(true);
sut.MoveNext().ShouldBe(true);
sut.MoveNext().ShouldBe(true);
sut.MoveNext().ShouldBe(true);
sut.MoveNext().ShouldBe(true);
sut.MoveNext().ShouldBe(false);
}
