v8/test/mjsunit/regress/regress-2443.js

// Copyright 2012 the V8 project authors. All rights reserved.
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//
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// Number.prototype methods on non-Numbers.

assertThrows(function() { Number.prototype.toExponential.call({}) },
             TypeError);

assertThrows(function() { Number.prototype.toPrecision.call({}) },
             TypeError);

assertThrows(function() { Number.prototype.toFixed.call({}) },
             TypeError);

assertThrows(function() { Number.prototype.toString.call({}) },
             TypeError);

assertThrows(function() { Number.prototype.toLocaleString.call({}) },
             TypeError);

assertThrows(function() { Number.prototype.ValueOf.call({}) },
             TypeError);


// Call on Number objects with custom valueOf method.

var x_obj = new Number(1);
x_obj.valueOf = function() { assertUnreachable(); };

assertEquals("1.00e+0",
             Number.prototype.toExponential.call(x_obj, 2));

assertEquals("1.0",
             Number.prototype.toPrecision.call(x_obj, 2));

assertEquals("1.00",
             Number.prototype.toFixed.call(x_obj, 2));

// Call on primitive numbers.
assertEquals("1.00e+0",
             Number.prototype.toExponential.call(1, 2));

assertEquals("1.0",
             Number.prototype.toPrecision.call(1, 2));

assertEquals("1.00",
             Number.prototype.toFixed.call(1, 2));


// toExponential and toPrecision does following steps in order
// 1) convert the argument using ToInteger
// 2) check for non-finite receiver, on which it returns,
// 3) check argument range and throw exception if out of range.
// Note that the the last two steps are reversed for toFixed.
// Luckily, the receiver is expected to be a number or number
// wrapper, so that getting its value is not observable.

var f_flag = false;
var f_obj = { valueOf: function() { f_flag = true; return 1000; } };

assertEquals("NaN",
             Number.prototype.toExponential.call(NaN, f_obj));
assertTrue(f_flag);

f_flag = false;
assertEquals("Infinity",
             Number.prototype.toExponential.call(1/0, f_obj));
assertTrue(f_flag);

f_flag = false;
assertEquals("-Infinity",
             Number.prototype.toExponential.call(-1/0, f_obj));
assertTrue(f_flag);

f_flag = false;
assertEquals("NaN",
             Number.prototype.toPrecision.call(NaN, f_obj));
assertTrue(f_flag);

f_flag = false;
assertEquals("Infinity",
             Number.prototype.toPrecision.call(1/0, f_obj));
assertTrue(f_flag);

f_flag = false;
assertEquals("-Infinity",
             Number.prototype.toPrecision.call(-1/0, f_obj));
assertTrue(f_flag);

// The odd man out: toFixed.

f_flag = false;
assertThrows(function() { Number.prototype.toFixed.call(NaN, f_obj) },
             RangeError);
assertTrue(f_flag);

f_flag = false;
assertThrows(function() { Number.prototype.toFixed.call(1/0, f_obj) },
             RangeError);
assertTrue(f_flag);

f_flag = false;
assertThrows(function() { Number.prototype.toFixed.call(-1/0, f_obj) },
             RangeError);
assertTrue(f_flag);