1// Copyright 2014 the V8 project authors. All rights reserved. 2// Redistribution and use in source and binary forms, with or without 3// modification, are permitted provided that the following conditions are 4// met: 5// 6// * Redistributions of source code must retain the above copyright 7// notice, this list of conditions and the following disclaimer. 8// * Redistributions in binary form must reproduce the above 9// copyright notice, this list of conditions and the following 10// disclaimer in the documentation and/or other materials provided 11// with the distribution. 12// * Neither the name of Google Inc. nor the names of its 13// contributors may be used to endorse or promote products derived 14// from this software without specific prior written permission. 15// 16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28assertEquals(1, String.prototype.startsWith.length); 29 30var testString = "Hello World"; 31assertTrue(testString.startsWith("")); 32assertTrue(testString.startsWith("Hello")); 33assertFalse(testString.startsWith("hello")); 34assertFalse(testString.startsWith("Hello World!")); 35assertFalse(testString.startsWith(null)); 36assertFalse(testString.startsWith(undefined)); 37 38assertTrue("null".startsWith(null)); 39assertTrue("undefined".startsWith(undefined)); 40 41var georgianUnicodeString = "\u10D0\u10D1\u10D2\u10D3\u10D4\u10D5\u10D6\u10D7"; 42assertTrue(georgianUnicodeString.startsWith(georgianUnicodeString)); 43assertTrue(georgianUnicodeString.startsWith("\u10D0\u10D1\u10D2")); 44assertFalse(georgianUnicodeString.startsWith("\u10D8")); 45 46assertThrows("String.prototype.startsWith.call(null, 'test')", TypeError); 47assertThrows("String.prototype.startsWith.call(null, null)", TypeError); 48assertThrows("String.prototype.startsWith.call(undefined, undefined)", TypeError); 49 50assertThrows("String.prototype.startsWith.apply(null, ['test'])", TypeError); 51assertThrows("String.prototype.startsWith.apply(null, [null])", TypeError); 52assertThrows("String.prototype.startsWith.apply(undefined, [undefined])", TypeError); 53 54var TEST_INPUT = [{ 55 msg: "Empty string", val: "" 56}, { 57 msg: "Number 1234.34", val: 1234.34 58}, { 59 msg: "Integer number 0", val: 0 60}, { 61 msg: "Negative number -1", val: -1 62}, { 63 msg: "Boolean true", val: true 64}, { 65 msg: "Boolean false", val: false 66}, { 67 msg: "Empty array []", val: [] 68}, { 69 msg: "Empty object {}", val: {} 70}, { 71 msg: "Array of size 3", val: new Array(3) 72}]; 73 74function testNonStringValues() { 75 var i = 0; 76 var l = TEST_INPUT.length; 77 78 for (; i < l; i++) { 79 var e = TEST_INPUT[i]; 80 var v = e.val; 81 var s = String(v); 82 assertTrue(s.startsWith(v), e.msg); 83 assertTrue(String.prototype.startsWith.call(v, v), e.msg); 84 assertTrue(String.prototype.startsWith.apply(v, [v]), e.msg); 85 } 86} 87testNonStringValues(); 88 89var CustomType = function(value) { 90 this.startsWith = String.prototype.startsWith; 91 this.toString = function() { 92 return String(value); 93 } 94}; 95 96function testCutomType() { 97 var i = 0; 98 var l = TEST_INPUT.length; 99 100 for (; i < l; i++) { 101 var e = TEST_INPUT[i]; 102 var v = e.val; 103 var o = new CustomType(v); 104 assertTrue(o.startsWith(v), e.msg); 105 } 106} 107testCutomType(); 108 109// Test cases found in FF 110assertTrue("abc".startsWith("abc")); 111assertTrue("abcd".startsWith("abc")); 112assertTrue("abc".startsWith("a")); 113assertFalse("abc".startsWith("abcd")); 114assertFalse("abc".startsWith("bcde")); 115assertFalse("abc".startsWith("b")); 116assertTrue("abc".startsWith("abc", 0)); 117assertFalse("abc".startsWith("bc", 0)); 118assertTrue("abc".startsWith("bc", 1)); 119assertFalse("abc".startsWith("c", 1)); 120assertFalse("abc".startsWith("abc", 1)); 121assertTrue("abc".startsWith("c", 2)); 122assertFalse("abc".startsWith("d", 2)); 123assertFalse("abc".startsWith("dcd", 2)); 124assertFalse("abc".startsWith("a", 42)); 125assertFalse("abc".startsWith("a", Infinity)); 126assertTrue("abc".startsWith("a", NaN)); 127assertFalse("abc".startsWith("b", NaN)); 128assertTrue("abc".startsWith("ab", -43)); 129assertTrue("abc".startsWith("ab", -Infinity)); 130assertFalse("abc".startsWith("bc", -42)); 131assertFalse("abc".startsWith("bc", -Infinity)); 132 133// Test cases taken from 134// https://github.com/mathiasbynens/String.prototype.startsWith/blob/master/tests/tests.js 135Object.prototype[1] = 2; // try to break `arguments[1]` 136 137assertEquals(String.prototype.startsWith.length, 1); 138assertEquals(String.prototype.propertyIsEnumerable("startsWith"), false); 139 140assertEquals("undefined".startsWith(), true); 141assertEquals("undefined".startsWith(undefined), true); 142assertEquals("undefined".startsWith(null), false); 143assertEquals("null".startsWith(), false); 144assertEquals("null".startsWith(undefined), false); 145assertEquals("null".startsWith(null), true); 146 147assertEquals("abc".startsWith(), false); 148assertEquals("abc".startsWith(""), true); 149assertEquals("abc".startsWith("\0"), false); 150assertEquals("abc".startsWith("a"), true); 151assertEquals("abc".startsWith("b"), false); 152assertEquals("abc".startsWith("ab"), true); 153assertEquals("abc".startsWith("bc"), false); 154assertEquals("abc".startsWith("abc"), true); 155assertEquals("abc".startsWith("bcd"), false); 156assertEquals("abc".startsWith("abcd"), false); 157assertEquals("abc".startsWith("bcde"), false); 158 159assertEquals("abc".startsWith("", NaN), true); 160assertEquals("abc".startsWith("\0", NaN), false); 161assertEquals("abc".startsWith("a", NaN), true); 162assertEquals("abc".startsWith("b", NaN), false); 163assertEquals("abc".startsWith("ab", NaN), true); 164assertEquals("abc".startsWith("bc", NaN), false); 165assertEquals("abc".startsWith("abc", NaN), true); 166assertEquals("abc".startsWith("bcd", NaN), false); 167assertEquals("abc".startsWith("abcd", NaN), false); 168assertEquals("abc".startsWith("bcde", NaN), false); 169 170assertEquals("abc".startsWith("", false), true); 171assertEquals("abc".startsWith("\0", false), false); 172assertEquals("abc".startsWith("a", false), true); 173assertEquals("abc".startsWith("b", false), false); 174assertEquals("abc".startsWith("ab", false), true); 175assertEquals("abc".startsWith("bc", false), false); 176assertEquals("abc".startsWith("abc", false), true); 177assertEquals("abc".startsWith("bcd", false), false); 178assertEquals("abc".startsWith("abcd", false), false); 179assertEquals("abc".startsWith("bcde", false), false); 180 181assertEquals("abc".startsWith("", undefined), true); 182assertEquals("abc".startsWith("\0", undefined), false); 183assertEquals("abc".startsWith("a", undefined), true); 184assertEquals("abc".startsWith("b", undefined), false); 185assertEquals("abc".startsWith("ab", undefined), true); 186assertEquals("abc".startsWith("bc", undefined), false); 187assertEquals("abc".startsWith("abc", undefined), true); 188assertEquals("abc".startsWith("bcd", undefined), false); 189assertEquals("abc".startsWith("abcd", undefined), false); 190assertEquals("abc".startsWith("bcde", undefined), false); 191 192assertEquals("abc".startsWith("", null), true); 193assertEquals("abc".startsWith("\0", null), false); 194assertEquals("abc".startsWith("a", null), true); 195assertEquals("abc".startsWith("b", null), false); 196assertEquals("abc".startsWith("ab", null), true); 197assertEquals("abc".startsWith("bc", null), false); 198assertEquals("abc".startsWith("abc", null), true); 199assertEquals("abc".startsWith("bcd", null), false); 200assertEquals("abc".startsWith("abcd", null), false); 201assertEquals("abc".startsWith("bcde", null), false); 202 203assertEquals("abc".startsWith("", -Infinity), true); 204assertEquals("abc".startsWith("\0", -Infinity), false); 205assertEquals("abc".startsWith("a", -Infinity), true); 206assertEquals("abc".startsWith("b", -Infinity), false); 207assertEquals("abc".startsWith("ab", -Infinity), true); 208assertEquals("abc".startsWith("bc", -Infinity), false); 209assertEquals("abc".startsWith("abc", -Infinity), true); 210assertEquals("abc".startsWith("bcd", -Infinity), false); 211assertEquals("abc".startsWith("abcd", -Infinity), false); 212assertEquals("abc".startsWith("bcde", -Infinity), false); 213 214assertEquals("abc".startsWith("", -1), true); 215assertEquals("abc".startsWith("\0", -1), false); 216assertEquals("abc".startsWith("a", -1), true); 217assertEquals("abc".startsWith("b", -1), false); 218assertEquals("abc".startsWith("ab", -1), true); 219assertEquals("abc".startsWith("bc", -1), false); 220assertEquals("abc".startsWith("abc", -1), true); 221assertEquals("abc".startsWith("bcd", -1), false); 222assertEquals("abc".startsWith("abcd", -1), false); 223assertEquals("abc".startsWith("bcde", -1), false); 224 225assertEquals("abc".startsWith("", -0), true); 226assertEquals("abc".startsWith("\0", -0), false); 227assertEquals("abc".startsWith("a", -0), true); 228assertEquals("abc".startsWith("b", -0), false); 229assertEquals("abc".startsWith("ab", -0), true); 230assertEquals("abc".startsWith("bc", -0), false); 231assertEquals("abc".startsWith("abc", -0), true); 232assertEquals("abc".startsWith("bcd", -0), false); 233assertEquals("abc".startsWith("abcd", -0), false); 234assertEquals("abc".startsWith("bcde", -0), false); 235 236assertEquals("abc".startsWith("", +0), true); 237assertEquals("abc".startsWith("\0", +0), false); 238assertEquals("abc".startsWith("a", +0), true); 239assertEquals("abc".startsWith("b", +0), false); 240assertEquals("abc".startsWith("ab", +0), true); 241assertEquals("abc".startsWith("bc", +0), false); 242assertEquals("abc".startsWith("abc", +0), true); 243assertEquals("abc".startsWith("bcd", +0), false); 244assertEquals("abc".startsWith("abcd", +0), false); 245assertEquals("abc".startsWith("bcde", +0), false); 246 247assertEquals("abc".startsWith("", 1), true); 248assertEquals("abc".startsWith("\0", 1), false); 249assertEquals("abc".startsWith("a", 1), false); 250assertEquals("abc".startsWith("b", 1), true); 251assertEquals("abc".startsWith("ab", 1), false); 252assertEquals("abc".startsWith("bc", 1), true); 253assertEquals("abc".startsWith("abc", 1), false); 254assertEquals("abc".startsWith("bcd", 1), false); 255assertEquals("abc".startsWith("abcd", 1), false); 256assertEquals("abc".startsWith("bcde", 1), false); 257 258assertEquals("abc".startsWith("", +Infinity), true); 259assertEquals("abc".startsWith("\0", +Infinity), false); 260assertEquals("abc".startsWith("a", +Infinity), false); 261assertEquals("abc".startsWith("b", +Infinity), false); 262assertEquals("abc".startsWith("ab", +Infinity), false); 263assertEquals("abc".startsWith("bc", +Infinity), false); 264assertEquals("abc".startsWith("abc", +Infinity), false); 265assertEquals("abc".startsWith("bcd", +Infinity), false); 266assertEquals("abc".startsWith("abcd", +Infinity), false); 267assertEquals("abc".startsWith("bcde", +Infinity), false); 268 269assertEquals("abc".startsWith("", true), true); 270assertEquals("abc".startsWith("\0", true), false); 271assertEquals("abc".startsWith("a", true), false); 272assertEquals("abc".startsWith("b", true), true); 273assertEquals("abc".startsWith("ab", true), false); 274assertEquals("abc".startsWith("bc", true), true); 275assertEquals("abc".startsWith("abc", true), false); 276assertEquals("abc".startsWith("bcd", true), false); 277assertEquals("abc".startsWith("abcd", true), false); 278assertEquals("abc".startsWith("bcde", true), false); 279 280assertEquals("abc".startsWith("", "x"), true); 281assertEquals("abc".startsWith("\0", "x"), false); 282assertEquals("abc".startsWith("a", "x"), true); 283assertEquals("abc".startsWith("b", "x"), false); 284assertEquals("abc".startsWith("ab", "x"), true); 285assertEquals("abc".startsWith("bc", "x"), false); 286assertEquals("abc".startsWith("abc", "x"), true); 287assertEquals("abc".startsWith("bcd", "x"), false); 288assertEquals("abc".startsWith("abcd", "x"), false); 289assertEquals("abc".startsWith("bcde", "x"), false); 290 291assertEquals("[a-z]+(bar)?".startsWith("[a-z]+"), true); 292assertThrows(function() { "[a-z]+(bar)?".startsWith(/[a-z]+/); }, TypeError); 293assertEquals("[a-z]+(bar)?".startsWith("(bar)?", 6), true); 294assertThrows(function() { "[a-z]+(bar)?".startsWith(/(bar)?/); }, TypeError); 295assertThrows(function() { "[a-z]+/(bar)?/".startsWith(/(bar)?/); }, TypeError); 296 297// http://mathiasbynens.be/notes/javascript-unicode#poo-test 298var string = "I\xF1t\xEBrn\xE2ti\xF4n\xE0liz\xE6ti\xF8n\u2603\uD83D\uDCA9"; 299assertEquals(string.startsWith(""), true); 300assertEquals(string.startsWith("\xF1t\xEBr"), false); 301assertEquals(string.startsWith("\xF1t\xEBr", 1), true); 302assertEquals(string.startsWith("\xE0liz\xE6"), false); 303assertEquals(string.startsWith("\xE0liz\xE6", 11), true); 304assertEquals(string.startsWith("\xF8n\u2603\uD83D\uDCA9"), false); 305assertEquals(string.startsWith("\xF8n\u2603\uD83D\uDCA9", 18), true); 306assertEquals(string.startsWith("\u2603"), false); 307assertEquals(string.startsWith("\u2603", 20), true); 308assertEquals(string.startsWith("\uD83D\uDCA9"), false); 309assertEquals(string.startsWith("\uD83D\uDCA9", 21), true); 310 311assertThrows(function() { 312 String.prototype.startsWith.call(undefined); 313}, TypeError); 314assertThrows(function() { 315 String.prototype.startsWith.call(undefined, "b"); 316}, TypeError); 317assertThrows(function() { 318 String.prototype.startsWith.call(undefined, "b", 4); 319}, TypeError); 320assertThrows(function() { 321 String.prototype.startsWith.call(null); 322}, TypeError); 323assertThrows(function() { 324 String.prototype.startsWith.call(null, "b"); 325}, TypeError); 326assertThrows(function() { 327 String.prototype.startsWith.call(null, "b", 4); 328}, TypeError); 329assertEquals(String.prototype.startsWith.call(42, "2"), false); 330assertEquals(String.prototype.startsWith.call(42, "4"), true); 331assertEquals(String.prototype.startsWith.call(42, "b", 4), false); 332assertEquals(String.prototype.startsWith.call(42, "2", 1), true); 333assertEquals(String.prototype.startsWith.call(42, "2", 4), false); 334assertEquals(String.prototype.startsWith.call({ 335 "toString": function() { return "abc"; } 336}, "b", 0), false); 337assertEquals(String.prototype.startsWith.call({ 338 "toString": function() { return "abc"; } 339}, "b", 1), true); 340assertEquals(String.prototype.startsWith.call({ 341 "toString": function() { return "abc"; } 342}, "b", 2), false); 343assertThrows(function() { 344 String.prototype.startsWith.call({ 345 "toString": function() { throw RangeError(); } 346 }, /./); 347}, RangeError); 348assertThrows(function() { 349 String.prototype.startsWith.call({ 350 "toString": function() { return "abc"; } 351 }, /./); 352}, TypeError); 353 354assertThrows(function() { 355 String.prototype.startsWith.apply(undefined); 356}, TypeError); 357assertThrows(function() { 358 String.prototype.startsWith.apply(undefined, ["b"]); 359}, TypeError); 360assertThrows(function() { 361 String.prototype.startsWith.apply(undefined, ["b", 4]); 362}, TypeError); 363assertThrows(function() { 364 String.prototype.startsWith.apply(null); 365}, TypeError); 366assertThrows(function() { 367 String.prototype.startsWith.apply(null, ["b"]); 368}, TypeError); 369assertThrows(function() { 370 String.prototype.startsWith.apply(null, ["b", 4]); 371}, TypeError); 372assertEquals(String.prototype.startsWith.apply(42, ["2"]), false); 373assertEquals(String.prototype.startsWith.apply(42, ["4"]), true); 374assertEquals(String.prototype.startsWith.apply(42, ["b", 4]), false); 375assertEquals(String.prototype.startsWith.apply(42, ["2", 1]), true); 376assertEquals(String.prototype.startsWith.apply(42, ["2", 4]), false); 377assertEquals(String.prototype.startsWith.apply({ 378 "toString": function() { 379 return "abc"; 380 } 381}, ["b", 0]), false); 382assertEquals(String.prototype.startsWith.apply({ 383 "toString": function() { 384 return "abc"; 385 } 386}, ["b", 1]), true); 387assertEquals(String.prototype.startsWith.apply({ 388 "toString": function() { 389 return "abc"; 390 } 391}, ["b", 2]), false); 392assertThrows(function() { 393 String.prototype.startsWith.apply({ 394 "toString": function() { throw RangeError(); } 395 }, [/./]); 396}, RangeError); 397assertThrows(function() { 398 String.prototype.startsWith.apply({ 399 "toString": function() { return "abc"; } 400 }, [/./]); 401}, TypeError); 402