public void Cells()
{
var map = new SpatialMap <int>(10);
Assert.Empty(map.Cells(new AABB(0, 0, 1, 1)));
// Realize the cells first so all the cell "seeding" occurs.
var newCells = map.Cells(new AABB(0, 0, 1, 1), true).ToList();
var existingCells = map.Cells(new AABB(0, 0, 1, 1)).ToList();
SequenceEqual(newCells, existingCells);
Assert.Equal(4, new SpatialMap <int>(10).Cells(new AABB(-1, -1, 2, 2), true).Count());
Assert.Equal(4, new SpatialMap <int>(1).Cells(new AABB(-0.5f, 0.5f, 3, 1), true).Count());
}
