src/v8/test/mjsunit/harmony/string-fromcodepoint.js

   1 // Copyright 2014 the V8 project authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // Flags: --harmony-strings
   6
   7 // Tests taken from:
   8 // https://github.com/mathiasbynens/String.fromCodePoint
   9
  10 assertEquals(String.fromCodePoint.length, 1);
  11 assertEquals(String.propertyIsEnumerable("fromCodePoint"), false);
  12
  13 assertEquals(String.fromCodePoint(""), "\0");
  14 assertEquals(String.fromCodePoint(), "");
  15 assertEquals(String.fromCodePoint(-0), "\0");
  16 assertEquals(String.fromCodePoint(0), "\0");
  17 assertEquals(String.fromCodePoint(0x1D306), "\uD834\uDF06");
  18 assertEquals(
  19     String.fromCodePoint(0x1D306, 0x61, 0x1D307),
  20     "\uD834\uDF06a\uD834\uDF07");
  21 assertEquals(String.fromCodePoint(0x61, 0x62, 0x1D307), "ab\uD834\uDF07");
  22 assertEquals(String.fromCodePoint(false), "\0");
  23 assertEquals(String.fromCodePoint(null), "\0");
  24
  25 assertThrows(function() { String.fromCodePoint("_"); }, RangeError);
  26 assertThrows(function() { String.fromCodePoint("+Infinity"); }, RangeError);
  27 assertThrows(function() { String.fromCodePoint("-Infinity"); }, RangeError);
  28 assertThrows(function() { String.fromCodePoint(-1); }, RangeError);
  29 assertThrows(function() { String.fromCodePoint(0x10FFFF + 1); }, RangeError);
  30 assertThrows(function() { String.fromCodePoint(3.14); }, RangeError);
  31 assertThrows(function() { String.fromCodePoint(3e-2); }, RangeError);
  32 assertThrows(function() { String.fromCodePoint(-Infinity); }, RangeError);
  33 assertThrows(function() { String.fromCodePoint(+Infinity); }, RangeError);
  34 assertThrows(function() { String.fromCodePoint(NaN); }, RangeError);
  35 assertThrows(function() { String.fromCodePoint(undefined); }, RangeError);
  36 assertThrows(function() { String.fromCodePoint({}); }, RangeError);
  37 assertThrows(function() { String.fromCodePoint(/./); }, RangeError);
  38 assertThrows(function() { String.fromCodePoint({
  39   valueOf: function() { throw Error(); } });
  40 }, Error);
  41 assertThrows(function() { String.fromCodePoint({
  42   valueOf: function() { throw Error(); } });
  43 }, Error);
  44 var tmp = 0x60;
  45 assertEquals(String.fromCodePoint({
  46   valueOf: function() { ++tmp; return tmp; }
  47 }), "a");
  48 assertEquals(tmp, 0x61);
  49
  50 var counter = Math.pow(2, 15) * 3 / 2;
  51 var result = [];
  52 while (--counter >= 0) {
  53   result.push(0); // one code unit per symbol
  54 }
  55 String.fromCodePoint.apply(null, result); // must not throw
  56
  57 var counter = Math.pow(2, 15) * 3 / 2;
  58 var result = [];
  59 while (--counter >= 0) {
  60   result.push(0xFFFF + 1); // two code units per symbol
  61 }
  62 String.fromCodePoint.apply(null, result); // must not throw