text: import pytest
  import rpy2.rlike.indexing as rfi
  
  
  def test_order():
      seq  = (2, 1, 5, 3, 4)
      expected = (1, 2, 3, 4, 5)
      res = rfi.order(seq)
      for va, vb in zip(expected, res):
          assert seq[vb] == va
  