testAddAnyInconvertibleObject.js

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function testAddAnyInconvertibleObject()

  var count = 0;

  function toString() { ++count; if (count == 95) return {}; return "" + count; }

  var o = {valueOf: undefined, toString: toString};

  var threw = false;

try

    for (var i = 0; i < 100; i++)

        var q = 5 + o;

  catch (e)

    threw = true;

    if (i !== 94)

      return "expected i === 94, got " + i;

    if (q !== "594")

      return "expected q === '594', got " + q + " (type " + typeof q + ")";

    if (count !== 95)

      return "expected count === 95, got " + count;

  if (!threw)

    return "expected throw with 5 + o"; // hey, a rhyme!

  return "pass";

assertEq(testAddAnyInconvertibleObject(), "pass");