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 28 assertEquals(1, String.prototype.startsWith.length); 29 30 var testString = "Hello World"; 31 assertTrue(testString.startsWith("")); 32 assertTrue(testString.startsWith("Hello")); 33 assertFalse(testString.startsWith("hello")); 34 assertFalse(testString.startsWith("Hello World!")); 35 assertFalse(testString.startsWith(null)); 36 assertFalse(testString.startsWith(undefined)); 37 38 assertTrue("null".startsWith(null)); 39 assertTrue("undefined".startsWith(undefined)); 40 41 var georgianUnicodeString = "\u10D0\u10D1\u10D2\u10D3\u10D4\u10D5\u10D6\u10D7"; 42 assertTrue(georgianUnicodeString.startsWith(georgianUnicodeString)); 43 assertTrue(georgianUnicodeString.startsWith("\u10D0\u10D1\u10D2")); 44 assertFalse(georgianUnicodeString.startsWith("\u10D8")); 45 46 assertThrows("String.prototype.startsWith.call(null, 'test')", TypeError); 47 assertThrows("String.prototype.startsWith.call(null, null)", TypeError); 48 assertThrows("String.prototype.startsWith.call(undefined, undefined)", TypeError); 49 50 assertThrows("String.prototype.startsWith.apply(null, ['test'])", TypeError); 51 assertThrows("String.prototype.startsWith.apply(null, [null])", TypeError); 52 assertThrows("String.prototype.startsWith.apply(undefined, [undefined])", TypeError); 53 54 var 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 74 function 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 } 87 testNonStringValues(); 88 89 var CustomType = function(value) { 90 this.startsWith = String.prototype.startsWith; 91 this.toString = function() { 92 return String(value); 93 } 94 }; 95 96 function 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 } 107 testCutomType(); 108 109 // Test cases found in FF 110 assertTrue("abc".startsWith("abc")); 111 assertTrue("abcd".startsWith("abc")); 112 assertTrue("abc".startsWith("a")); 113 assertFalse("abc".startsWith("abcd")); 114 assertFalse("abc".startsWith("bcde")); 115 assertFalse("abc".startsWith("b")); 116 assertTrue("abc".startsWith("abc", 0)); 117 assertFalse("abc".startsWith("bc", 0)); 118 assertTrue("abc".startsWith("bc", 1)); 119 assertFalse("abc".startsWith("c", 1)); 120 assertFalse("abc".startsWith("abc", 1)); 121 assertTrue("abc".startsWith("c", 2)); 122 assertFalse("abc".startsWith("d", 2)); 123 assertFalse("abc".startsWith("dcd", 2)); 124 assertFalse("abc".startsWith("a", 42)); 125 assertFalse("abc".startsWith("a", Infinity)); 126 assertTrue("abc".startsWith("a", NaN)); 127 assertFalse("abc".startsWith("b", NaN)); 128 assertTrue("abc".startsWith("ab", -43)); 129 assertTrue("abc".startsWith("ab", -Infinity)); 130 assertFalse("abc".startsWith("bc", -42)); 131 assertFalse("abc".startsWith("bc", -Infinity)); 132 133 // Test cases taken from 134 // https://github.com/mathiasbynens/String.prototype.startsWith/blob/master/tests/tests.js 135 Object.prototype[1] = 2; // try to break `arguments[1]` 136 137 assertEquals(String.prototype.startsWith.length, 1); 138 assertEquals(String.prototype.propertyIsEnumerable("startsWith"), false); 139 140 assertEquals("undefined".startsWith(), true); 141 assertEquals("undefined".startsWith(undefined), true); 142 assertEquals("undefined".startsWith(null), false); 143 assertEquals("null".startsWith(), false); 144 assertEquals("null".startsWith(undefined), false); 145 assertEquals("null".startsWith(null), true); 146 147 assertEquals("abc".startsWith(), false); 148 assertEquals("abc".startsWith(""), true); 149 assertEquals("abc".startsWith("\0"), false); 150 assertEquals("abc".startsWith("a"), true); 151 assertEquals("abc".startsWith("b"), false); 152 assertEquals("abc".startsWith("ab"), true); 153 assertEquals("abc".startsWith("bc"), false); 154 assertEquals("abc".startsWith("abc"), true); 155 assertEquals("abc".startsWith("bcd"), false); 156 assertEquals("abc".startsWith("abcd"), false); 157 assertEquals("abc".startsWith("bcde"), false); 158 159 assertEquals("abc".startsWith("", NaN), true); 160 assertEquals("abc".startsWith("\0", NaN), false); 161 assertEquals("abc".startsWith("a", NaN), true); 162 assertEquals("abc".startsWith("b", NaN), false); 163 assertEquals("abc".startsWith("ab", NaN), true); 164 assertEquals("abc".startsWith("bc", NaN), false); 165 assertEquals("abc".startsWith("abc", NaN), true); 166 assertEquals("abc".startsWith("bcd", NaN), false); 167 assertEquals("abc".startsWith("abcd", NaN), false); 168 assertEquals("abc".startsWith("bcde", NaN), false); 169 170 assertEquals("abc".startsWith("", false), true); 171 assertEquals("abc".startsWith("\0", false), false); 172 assertEquals("abc".startsWith("a", false), true); 173 assertEquals("abc".startsWith("b", false), false); 174 assertEquals("abc".startsWith("ab", false), true); 175 assertEquals("abc".startsWith("bc", false), false); 176 assertEquals("abc".startsWith("abc", false), true); 177 assertEquals("abc".startsWith("bcd", false), false); 178 assertEquals("abc".startsWith("abcd", false), false); 179 assertEquals("abc".startsWith("bcde", false), false); 180 181 assertEquals("abc".startsWith("", undefined), true); 182 assertEquals("abc".startsWith("\0", undefined), false); 183 assertEquals("abc".startsWith("a", undefined), true); 184 assertEquals("abc".startsWith("b", undefined), false); 185 assertEquals("abc".startsWith("ab", undefined), true); 186 assertEquals("abc".startsWith("bc", undefined), false); 187 assertEquals("abc".startsWith("abc", undefined), true); 188 assertEquals("abc".startsWith("bcd", undefined), false); 189 assertEquals("abc".startsWith("abcd", undefined), false); 190 assertEquals("abc".startsWith("bcde", undefined), false); 191 192 assertEquals("abc".startsWith("", null), true); 193 assertEquals("abc".startsWith("\0", null), false); 194 assertEquals("abc".startsWith("a", null), true); 195 assertEquals("abc".startsWith("b", null), false); 196 assertEquals("abc".startsWith("ab", null), true); 197 assertEquals("abc".startsWith("bc", null), false); 198 assertEquals("abc".startsWith("abc", null), true); 199 assertEquals("abc".startsWith("bcd", null), false); 200 assertEquals("abc".startsWith("abcd", null), false); 201 assertEquals("abc".startsWith("bcde", null), false); 202 203 assertEquals("abc".startsWith("", -Infinity), true); 204 assertEquals("abc".startsWith("\0", -Infinity), false); 205 assertEquals("abc".startsWith("a", -Infinity), true); 206 assertEquals("abc".startsWith("b", -Infinity), false); 207 assertEquals("abc".startsWith("ab", -Infinity), true); 208 assertEquals("abc".startsWith("bc", -Infinity), false); 209 assertEquals("abc".startsWith("abc", -Infinity), true); 210 assertEquals("abc".startsWith("bcd", -Infinity), false); 211 assertEquals("abc".startsWith("abcd", -Infinity), false); 212 assertEquals("abc".startsWith("bcde", -Infinity), false); 213 214 assertEquals("abc".startsWith("", -1), true); 215 assertEquals("abc".startsWith("\0", -1), false); 216 assertEquals("abc".startsWith("a", -1), true); 217 assertEquals("abc".startsWith("b", -1), false); 218 assertEquals("abc".startsWith("ab", -1), true); 219 assertEquals("abc".startsWith("bc", -1), false); 220 assertEquals("abc".startsWith("abc", -1), true); 221 assertEquals("abc".startsWith("bcd", -1), false); 222 assertEquals("abc".startsWith("abcd", -1), false); 223 assertEquals("abc".startsWith("bcde", -1), false); 224 225 assertEquals("abc".startsWith("", -0), true); 226 assertEquals("abc".startsWith("\0", -0), false); 227 assertEquals("abc".startsWith("a", -0), true); 228 assertEquals("abc".startsWith("b", -0), false); 229 assertEquals("abc".startsWith("ab", -0), true); 230 assertEquals("abc".startsWith("bc", -0), false); 231 assertEquals("abc".startsWith("abc", -0), true); 232 assertEquals("abc".startsWith("bcd", -0), false); 233 assertEquals("abc".startsWith("abcd", -0), false); 234 assertEquals("abc".startsWith("bcde", -0), false); 235 236 assertEquals("abc".startsWith("", +0), true); 237 assertEquals("abc".startsWith("\0", +0), false); 238 assertEquals("abc".startsWith("a", +0), true); 239 assertEquals("abc".startsWith("b", +0), false); 240 assertEquals("abc".startsWith("ab", +0), true); 241 assertEquals("abc".startsWith("bc", +0), false); 242 assertEquals("abc".startsWith("abc", +0), true); 243 assertEquals("abc".startsWith("bcd", +0), false); 244 assertEquals("abc".startsWith("abcd", +0), false); 245 assertEquals("abc".startsWith("bcde", +0), false); 246 247 assertEquals("abc".startsWith("", 1), true); 248 assertEquals("abc".startsWith("\0", 1), false); 249 assertEquals("abc".startsWith("a", 1), false); 250 assertEquals("abc".startsWith("b", 1), true); 251 assertEquals("abc".startsWith("ab", 1), false); 252 assertEquals("abc".startsWith("bc", 1), true); 253 assertEquals("abc".startsWith("abc", 1), false); 254 assertEquals("abc".startsWith("bcd", 1), false); 255 assertEquals("abc".startsWith("abcd", 1), false); 256 assertEquals("abc".startsWith("bcde", 1), false); 257 258 assertEquals("abc".startsWith("", +Infinity), true); 259 assertEquals("abc".startsWith("\0", +Infinity), false); 260 assertEquals("abc".startsWith("a", +Infinity), false); 261 assertEquals("abc".startsWith("b", +Infinity), false); 262 assertEquals("abc".startsWith("ab", +Infinity), false); 263 assertEquals("abc".startsWith("bc", +Infinity), false); 264 assertEquals("abc".startsWith("abc", +Infinity), false); 265 assertEquals("abc".startsWith("bcd", +Infinity), false); 266 assertEquals("abc".startsWith("abcd", +Infinity), false); 267 assertEquals("abc".startsWith("bcde", +Infinity), false); 268 269 assertEquals("abc".startsWith("", true), true); 270 assertEquals("abc".startsWith("\0", true), false); 271 assertEquals("abc".startsWith("a", true), false); 272 assertEquals("abc".startsWith("b", true), true); 273 assertEquals("abc".startsWith("ab", true), false); 274 assertEquals("abc".startsWith("bc", true), true); 275 assertEquals("abc".startsWith("abc", true), false); 276 assertEquals("abc".startsWith("bcd", true), false); 277 assertEquals("abc".startsWith("abcd", true), false); 278 assertEquals("abc".startsWith("bcde", true), false); 279 280 assertEquals("abc".startsWith("", "x"), true); 281 assertEquals("abc".startsWith("\0", "x"), false); 282 assertEquals("abc".startsWith("a", "x"), true); 283 assertEquals("abc".startsWith("b", "x"), false); 284 assertEquals("abc".startsWith("ab", "x"), true); 285 assertEquals("abc".startsWith("bc", "x"), false); 286 assertEquals("abc".startsWith("abc", "x"), true); 287 assertEquals("abc".startsWith("bcd", "x"), false); 288 assertEquals("abc".startsWith("abcd", "x"), false); 289 assertEquals("abc".startsWith("bcde", "x"), false); 290 291 assertEquals("[a-z]+(bar)?".startsWith("[a-z]+"), true); 292 assertThrows(function() { "[a-z]+(bar)?".startsWith(/[a-z]+/); }, TypeError); 293 assertEquals("[a-z]+(bar)?".startsWith("(bar)?", 6), true); 294 assertThrows(function() { "[a-z]+(bar)?".startsWith(/(bar)?/); }, TypeError); 295 assertThrows(function() { "[a-z]+/(bar)?/".startsWith(/(bar)?/); }, TypeError); 296 297 // http://mathiasbynens.be/notes/javascript-unicode#poo-test 298 var string = "I\xF1t\xEBrn\xE2ti\xF4n\xE0liz\xE6ti\xF8n\u2603\uD83D\uDCA9"; 299 assertEquals(string.startsWith(""), true); 300 assertEquals(string.startsWith("\xF1t\xEBr"), false); 301 assertEquals(string.startsWith("\xF1t\xEBr", 1), true); 302 assertEquals(string.startsWith("\xE0liz\xE6"), false); 303 assertEquals(string.startsWith("\xE0liz\xE6", 11), true); 304 assertEquals(string.startsWith("\xF8n\u2603\uD83D\uDCA9"), false); 305 assertEquals(string.startsWith("\xF8n\u2603\uD83D\uDCA9", 18), true); 306 assertEquals(string.startsWith("\u2603"), false); 307 assertEquals(string.startsWith("\u2603", 20), true); 308 assertEquals(string.startsWith("\uD83D\uDCA9"), false); 309 assertEquals(string.startsWith("\uD83D\uDCA9", 21), true); 310 311 assertThrows(function() { 312 String.prototype.startsWith.call(undefined); 313 }, TypeError); 314 assertThrows(function() { 315 String.prototype.startsWith.call(undefined, "b"); 316 }, TypeError); 317 assertThrows(function() { 318 String.prototype.startsWith.call(undefined, "b", 4); 319 }, TypeError); 320 assertThrows(function() { 321 String.prototype.startsWith.call(null); 322 }, TypeError); 323 assertThrows(function() { 324 String.prototype.startsWith.call(null, "b"); 325 }, TypeError); 326 assertThrows(function() { 327 String.prototype.startsWith.call(null, "b", 4); 328 }, TypeError); 329 assertEquals(String.prototype.startsWith.call(42, "2"), false); 330 assertEquals(String.prototype.startsWith.call(42, "4"), true); 331 assertEquals(String.prototype.startsWith.call(42, "b", 4), false); 332 assertEquals(String.prototype.startsWith.call(42, "2", 1), true); 333 assertEquals(String.prototype.startsWith.call(42, "2", 4), false); 334 assertEquals(String.prototype.startsWith.call({ 335 "toString": function() { return "abc"; } 336 }, "b", 0), false); 337 assertEquals(String.prototype.startsWith.call({ 338 "toString": function() { return "abc"; } 339 }, "b", 1), true); 340 assertEquals(String.prototype.startsWith.call({ 341 "toString": function() { return "abc"; } 342 }, "b", 2), false); 343 assertThrows(function() { 344 String.prototype.startsWith.call({ 345 "toString": function() { throw RangeError(); } 346 }, /./); 347 }, RangeError); 348 assertThrows(function() { 349 String.prototype.startsWith.call({ 350 "toString": function() { return "abc"; } 351 }, /./); 352 }, TypeError); 353 354 assertThrows(function() { 355 String.prototype.startsWith.apply(undefined); 356 }, TypeError); 357 assertThrows(function() { 358 String.prototype.startsWith.apply(undefined, ["b"]); 359 }, TypeError); 360 assertThrows(function() { 361 String.prototype.startsWith.apply(undefined, ["b", 4]); 362 }, TypeError); 363 assertThrows(function() { 364 String.prototype.startsWith.apply(null); 365 }, TypeError); 366 assertThrows(function() { 367 String.prototype.startsWith.apply(null, ["b"]); 368 }, TypeError); 369 assertThrows(function() { 370 String.prototype.startsWith.apply(null, ["b", 4]); 371 }, TypeError); 372 assertEquals(String.prototype.startsWith.apply(42, ["2"]), false); 373 assertEquals(String.prototype.startsWith.apply(42, ["4"]), true); 374 assertEquals(String.prototype.startsWith.apply(42, ["b", 4]), false); 375 assertEquals(String.prototype.startsWith.apply(42, ["2", 1]), true); 376 assertEquals(String.prototype.startsWith.apply(42, ["2", 4]), false); 377 assertEquals(String.prototype.startsWith.apply({ 378 "toString": function() { 379 return "abc"; 380 } 381 }, ["b", 0]), false); 382 assertEquals(String.prototype.startsWith.apply({ 383 "toString": function() { 384 return "abc"; 385 } 386 }, ["b", 1]), true); 387 assertEquals(String.prototype.startsWith.apply({ 388 "toString": function() { 389 return "abc"; 390 } 391 }, ["b", 2]), false); 392 assertThrows(function() { 393 String.prototype.startsWith.apply({ 394 "toString": function() { throw RangeError(); } 395 }, [/./]); 396 }, RangeError); 397 assertThrows(function() { 398 String.prototype.startsWith.apply({ 399 "toString": function() { return "abc"; } 400 }, [/./]); 401 }, TypeError); 402
