testAddInconvertibleObjectInconvertibleObject.js

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function testAddInconvertibleObjectInconvertibleObject()

  var count1 = 0;

  function toString1() { ++count1; if (count1 == 95) return {}; return "" + count1; }

  var o1 = {valueOf: undefined, toString: toString1};

  var count2 = 0;

  function toString2() { ++count2; if (count2 == 95) return {}; return "" + count2; }

  var o2 = {valueOf: undefined, toString: toString2};

  var threw = false;

try

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

        var q = o1 + o2;

  catch (e)

    threw = true;

    if (i !== 94)

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

    if (q !== "9494")

      return "expected q === '9494', got " + q + " (type " + typeof q + ")";

    if (count1 !== 95)

      return "expected count1 === 95, got " + count1;

    if (count2 !== 94)

      return "expected count2 === 94, got " + count2;

  if (!threw)

    return "expected throw with o1 + o2";

  return "pass";

assertEq(testAddInconvertibleObjectInconvertibleObject(), "pass");