src/v8/test/mjsunit/es6/string-codepointat.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.prototype.codePointAt

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

// String that starts with a BMP symbol
assertEquals("abc\uD834\uDF06def".codePointAt(""), 0x61);
assertEquals("abc\uD834\uDF06def".codePointAt("_"), 0x61);
assertEquals("abc\uD834\uDF06def".codePointAt(), 0x61);
assertEquals("abc\uD834\uDF06def".codePointAt(-Infinity), undefined);
assertEquals("abc\uD834\uDF06def".codePointAt(-1), undefined);
assertEquals("abc\uD834\uDF06def".codePointAt(-0), 0x61);
assertEquals("abc\uD834\uDF06def".codePointAt(0), 0x61);
assertEquals("abc\uD834\uDF06def".codePointAt(3), 0x1D306);
assertEquals("abc\uD834\uDF06def".codePointAt(4), 0xDF06);
assertEquals("abc\uD834\uDF06def".codePointAt(5), 0x64);
assertEquals("abc\uD834\uDF06def".codePointAt(42), undefined);
assertEquals("abc\uD834\uDF06def".codePointAt(Infinity), undefined);
assertEquals("abc\uD834\uDF06def".codePointAt(Infinity), undefined);
assertEquals("abc\uD834\uDF06def".codePointAt(NaN), 0x61);
assertEquals("abc\uD834\uDF06def".codePointAt(false), 0x61);
assertEquals("abc\uD834\uDF06def".codePointAt(null), 0x61);
assertEquals("abc\uD834\uDF06def".codePointAt(undefined), 0x61);

// String that starts with an astral symbol
assertEquals("\uD834\uDF06def".codePointAt(""), 0x1D306);
assertEquals("\uD834\uDF06def".codePointAt("1"), 0xDF06);
assertEquals("\uD834\uDF06def".codePointAt("_"), 0x1D306);
assertEquals("\uD834\uDF06def".codePointAt(), 0x1D306);
assertEquals("\uD834\uDF06def".codePointAt(-1), undefined);
assertEquals("\uD834\uDF06def".codePointAt(-0), 0x1D306);
assertEquals("\uD834\uDF06def".codePointAt(0), 0x1D306);
assertEquals("\uD834\uDF06def".codePointAt(1), 0xDF06);
assertEquals("\uD834\uDF06def".codePointAt(42), undefined);
assertEquals("\uD834\uDF06def".codePointAt(false), 0x1D306);
assertEquals("\uD834\uDF06def".codePointAt(null), 0x1D306);
assertEquals("\uD834\uDF06def".codePointAt(undefined), 0x1D306);

// Lone high surrogates
assertEquals("\uD834abc".codePointAt(""), 0xD834);
assertEquals("\uD834abc".codePointAt("_"), 0xD834);
assertEquals("\uD834abc".codePointAt(), 0xD834);
assertEquals("\uD834abc".codePointAt(-1), undefined);
assertEquals("\uD834abc".codePointAt(-0), 0xD834);
assertEquals("\uD834abc".codePointAt(0), 0xD834);
assertEquals("\uD834abc".codePointAt(false), 0xD834);
assertEquals("\uD834abc".codePointAt(NaN), 0xD834);
assertEquals("\uD834abc".codePointAt(null), 0xD834);
assertEquals("\uD834abc".codePointAt(undefined), 0xD834);

// Lone low surrogates
assertEquals("\uDF06abc".codePointAt(""), 0xDF06);
assertEquals("\uDF06abc".codePointAt("_"), 0xDF06);
assertEquals("\uDF06abc".codePointAt(), 0xDF06);
assertEquals("\uDF06abc".codePointAt(-1), undefined);
assertEquals("\uDF06abc".codePointAt(-0), 0xDF06);
assertEquals("\uDF06abc".codePointAt(0), 0xDF06);
assertEquals("\uDF06abc".codePointAt(false), 0xDF06);
assertEquals("\uDF06abc".codePointAt(NaN), 0xDF06);
assertEquals("\uDF06abc".codePointAt(null), 0xDF06);
assertEquals("\uDF06abc".codePointAt(undefined), 0xDF06);

assertThrows(function() {
  String.prototype.codePointAt.call(undefined);
}, TypeError);
assertThrows(function() {
  String.prototype.codePointAt.call(undefined, 4);
}, TypeError);
assertThrows(function() {
  String.prototype.codePointAt.call(null);
}, TypeError);
assertThrows(function() {
  String.prototype.codePointAt.call(null, 4);
}, TypeError);
assertEquals(String.prototype.codePointAt.call(42, 0), 0x34);
assertEquals(String.prototype.codePointAt.call(42, 1), 0x32);
assertEquals(String.prototype.codePointAt.call({
  toString: function() { return "abc"; }
}, 2), 0x63);
var tmp = 0;
assertEquals(String.prototype.codePointAt.call({
  toString: function() { ++tmp; return String(tmp); }
}, 0), 0x31);
assertEquals(tmp, 1);