public void ClearTest()
{
HexBoard hexBoard = new HexBoard(BoardSize);
// set a cell
hexBoard.PlayMove(1, 1, true);
Assert.AreEqual(Occupied.PlayerX, hexBoard.GetCellOccupiedAt(1, 1));
Location loc11 = new Location(1, 1);
Assert.AreEqual(Occupied.PlayerX, hexBoard.GetCellOccupiedAt(1, 1));
Assert.AreEqual(Occupied.PlayerX, hexBoard.GetCellOccupiedAt(loc11));
// reset it
hexBoard.Clear();
Assert.AreEqual(Occupied.Empty, hexBoard.GetCellOccupiedAt(1, 1));
Assert.AreEqual(Occupied.Empty, hexBoard.GetCellOccupiedAt(loc11));
}