test_for = ->
  run_test [

    "x=0\ny=2\nfor(do(x=sqrt(2+x),y=2*y/x), k,1,9)\nfloat(y)",
    "3.141588...",

    "for(do(x=sqrt(2+x),y=2*y/x),k,1,iterations)",
    "for(do(x=sqrt(2+x),y=2*y/x),k,1,iterations)",

  ]