public void TestGetContainingSquare(
[Values(2, 3, 2, 4)] int columns,
[Values(2, 2, 3, 4)] int rows)
{
var pf = new Playfield(columns, rows);
for (int c = 0; c < pf.NumCellColumns; c++)
{
for (int r = 0; r < pf.NumCellRows; r++)
{
var cell = pf.Cells[c][r];
var ul = pf.GetContainingSquare(cell, Playfield.SquarePosition.UpperLeft);
Assert.AreEqual(ul, c >= pf.NumSquareColumns || r >= pf.NumSquareRows ? null : pf.Squares[c][r]);
var ll = pf.GetContainingSquare(cell, Playfield.SquarePosition.LowerLeft);
Assert.AreEqual(ll, c >= pf.NumSquareColumns || r <= 0 ? null : pf.Squares[c][r - 1]);
var ur = pf.GetContainingSquare(cell, Playfield.SquarePosition.UpperRight);
Assert.AreEqual(ur, c <= 0 || r >= pf.NumSquareRows ? null : pf.Squares[c - 1][r]);
var lr = pf.GetContainingSquare(cell, Playfield.SquarePosition.LowerRight);
Assert.AreEqual(lr, c <= 0 || r <= 0 ? null : pf.Squares[c - 1][r - 1]);
}
}
}