public void ContainsKeyTest()
{
var queue = _random.UniqueNumberQueue();
var coord = HexCoordinates.Axial(queue.Dequeue(), queue.Dequeue());
_grid.Add(coord, queue.Dequeue());
Assert.True(_grid.ContainsKey(coord));
var coord2 = HexCoordinates.Axial(queue.Dequeue(), queue.Dequeue());
Assert.False(_grid.ContainsKey(coord2));
}