test/mjsunit/es6/string-fromcodepoint.js

// Copyright 2014 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Tests taken from:
// https://github.com/mathiasbynens/String.fromCodePoint

assertEquals(String.fromCodePoint.length, 1);
assertEquals(String.propertyIsEnumerable("fromCodePoint"), false);

assertEquals(String.fromCodePoint(""), "\0");
assertEquals(String.fromCodePoint(), "");
assertEquals(String.fromCodePoint(-0), "\0");
assertEquals(String.fromCodePoint(0), "\0");
assertEquals(String.fromCodePoint(0x1D306), "\uD834\uDF06");
assertEquals(
    String.fromCodePoint(0x1D306, 0x61, 0x1D307),
    "\uD834\uDF06a\uD834\uDF07");
assertEquals(String.fromCodePoint(0x61, 0x62, 0x1D307), "ab\uD834\uDF07");
assertEquals(String.fromCodePoint(false), "\0");
assertEquals(String.fromCodePoint(null), "\0");

assertThrows(function() { String.fromCodePoint("_"); }, RangeError);
assertThrows(function() { String.fromCodePoint("+Infinity"); }, RangeError);
assertThrows(function() { String.fromCodePoint("-Infinity"); }, RangeError);
assertThrows(function() { String.fromCodePoint(-1); }, RangeError);
assertThrows(function() { String.fromCodePoint(0x10FFFF + 1); }, RangeError);
assertThrows(function() { String.fromCodePoint(3.14); }, RangeError);
assertThrows(function() { String.fromCodePoint(3e-2); }, RangeError);
assertThrows(function() { String.fromCodePoint(-Infinity); }, RangeError);
assertThrows(function() { String.fromCodePoint(+Infinity); }, RangeError);
assertThrows(function() { String.fromCodePoint(NaN); }, RangeError);
assertThrows(function() { String.fromCodePoint(undefined); }, RangeError);
assertThrows(function() { String.fromCodePoint({}); }, RangeError);
assertThrows(function() { String.fromCodePoint(/./); }, RangeError);
assertThrows(function() { String.fromCodePoint({
  valueOf: function() { throw Error(); } });
}, Error);
assertThrows(function() { String.fromCodePoint({
  valueOf: function() { throw Error(); } });
}, Error);
var tmp = 0x60;
assertEquals(String.fromCodePoint({
  valueOf: function() { ++tmp; return tmp; }
}), "a");
assertEquals(tmp, 0x61);

var counter = Math.pow(2, 15) * 3 / 2;
var result = [];
while (--counter >= 0) {
  result.push(0); // one code unit per symbol
}
String.fromCodePoint.apply(null, result); // must not throw

var counter = Math.pow(2, 15) * 3 / 2;
var result = [];
while (--counter >= 0) {
  result.push(0xFFFF + 1); // two code units per symbol
}
String.fromCodePoint.apply(null, result); // must not throw