test_ceiling = ->
  run_test [
    "ceiling(a)",
    "ceiling(a)",

    "ceiling(a+b)",
    "ceiling(a+b)",

    "ceiling(5/2)",
    "3",

    "ceiling(4/2)",
    "2",

    "ceiling(3/2)",
    "2",

    "ceiling(2/2)",
    "1",

    "ceiling(1/2)",
    "1",

    "ceiling(0/2)",
    "0",

    "ceiling(-1/2)",
    "0",

    "ceiling(-2/2)",
    "-1",

    "ceiling(-3/2)",
    "-1",

    "ceiling(-4/2)",
    "-2",

    "ceiling(-5/2)",
    "-2",

    "ceiling(5/2.0)",
    "3.0",

    "ceiling(4/2.0)",
    "2.0",

    "ceiling(3/2.0)",
    "2.0",

    "ceiling(2/2.0)",
    "1.0",

    "ceiling(1/2.0)",
    "1.0",

    "ceiling(0.0)",
    "0.0",

    "ceiling(-1/2.0)",
    "0.0",

    "ceiling(-2/2.0)",
    "-1.0",

    "ceiling(-3/2.0)",
    "-1.0",

    "ceiling(-4/2.0)",
    "-2.0",

    "ceiling(-5/2.0)",
    "-2.0",
  ]