local ut = {}

function ut.cellid()
    local sc = cellgrid.scale()
    local cid = cellgrid.cellid(0,0,0)
    assert(cellgrid.cellid(0,0,0) == 0x0001000000000000)
    assert(cellgrid.cellid( 1*sc,  2*sc,  3*sc) == 0x0001000100020003)
    assert(cellgrid.cellid(-1*sc, -2*sc, -3*sc) == 0x0001FFFFFFFEFFFD)
    assert(cellgrid.cellid(10000000, 0, 0) == 0)
end

rununittests(ut)