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

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  27
  28 // Flags: --harmony-strings
  29
  30 assertEquals(1, String.prototype.startsWith.length);
  31
  32 var testString = "Hello World";
  33 assertTrue(testString.startsWith(""));
  34 assertTrue(testString.startsWith("Hello"));
  35 assertFalse(testString.startsWith("hello"));
  36 assertFalse(testString.startsWith("Hello World!"));
  37 assertFalse(testString.startsWith(null));
  38 assertFalse(testString.startsWith(undefined));
  39
  40 assertTrue("null".startsWith(null));
  41 assertTrue("undefined".startsWith(undefined));
  42
  43 var georgianUnicodeString = "\u10D0\u10D1\u10D2\u10D3\u10D4\u10D5\u10D6\u10D7";
  44 assertTrue(georgianUnicodeString.startsWith(georgianUnicodeString));
  45 assertTrue(georgianUnicodeString.startsWith("\u10D0\u10D1\u10D2"));
  46 assertFalse(georgianUnicodeString.startsWith("\u10D8"));
  47
  48 assertThrows("String.prototype.startsWith.call(null, 'test')", TypeError);
  49 assertThrows("String.prototype.startsWith.call(null, null)", TypeError);
  50 assertThrows("String.prototype.startsWith.call(undefined, undefined)", TypeError);
  51
  52 assertThrows("String.prototype.startsWith.apply(null, ['test'])", TypeError);
  53 assertThrows("String.prototype.startsWith.apply(null, [null])", TypeError);
  54 assertThrows("String.prototype.startsWith.apply(undefined, [undefined])", TypeError);
  55
  56 var TEST_INPUT = [{
  57   msg: "Empty string", val: ""
  58 }, {
  59   msg: "Number 1234.34", val: 1234.34
  60 }, {
  61   msg: "Integer number 0", val: 0
  62 }, {
  63   msg: "Negative number -1", val: -1
  64 }, {
  65   msg: "Boolean true", val: true
  66 }, {
  67   msg: "Boolean false", val: false
  68 }, {
  69   msg: "Empty array []", val: []
  70 }, {
  71   msg: "Empty object {}", val: {}
  72 }, {
  73   msg: "Array of size 3", val: new Array(3)
  74 }];
  75
  76 function testNonStringValues() {
  77   var i = 0;
  78   var l = TEST_INPUT.length;
  79
  80   for (; i < l; i++) {
  81     var e = TEST_INPUT[i];
  82     var v = e.val;
  83     var s = String(v);
  84     assertTrue(s.startsWith(v), e.msg);
  85     assertTrue(String.prototype.startsWith.call(v, v), e.msg);
  86     assertTrue(String.prototype.startsWith.apply(v, [v]), e.msg);
  87   }
  88 }
  89 testNonStringValues();
  90
  91 var CustomType = function(value) {
  92   this.startsWith = String.prototype.startsWith;
  93   this.toString = function() {
  94     return String(value);
  95   }
  96 };
  97
  98 function testCutomType() {
  99   var i = 0;
 100   var l = TEST_INPUT.length;
 101
 102   for (; i < l; i++) {
 103     var e = TEST_INPUT[i];
 104     var v = e.val;
 105     var o = new CustomType(v);
 106     assertTrue(o.startsWith(v), e.msg);
 107   }
 108 }
 109 testCutomType();
 110
 111 // Test cases found in FF
 112 assertTrue("abc".startsWith("abc"));
 113 assertTrue("abcd".startsWith("abc"));
 114 assertTrue("abc".startsWith("a"));
 115 assertFalse("abc".startsWith("abcd"));
 116 assertFalse("abc".startsWith("bcde"));
 117 assertFalse("abc".startsWith("b"));
 118 assertTrue("abc".startsWith("abc", 0));
 119 assertFalse("abc".startsWith("bc", 0));
 120 assertTrue("abc".startsWith("bc", 1));
 121 assertFalse("abc".startsWith("c", 1));
 122 assertFalse("abc".startsWith("abc", 1));
 123 assertTrue("abc".startsWith("c", 2));
 124 assertFalse("abc".startsWith("d", 2));
 125 assertFalse("abc".startsWith("dcd", 2));
 126 assertFalse("abc".startsWith("a", 42));
 127 assertFalse("abc".startsWith("a", Infinity));
 128 assertTrue("abc".startsWith("a", NaN));
 129 assertFalse("abc".startsWith("b", NaN));
 130 assertTrue("abc".startsWith("ab", -43));
 131 assertTrue("abc".startsWith("ab", -Infinity));
 132 assertFalse("abc".startsWith("bc", -42));
 133 assertFalse("abc".startsWith("bc", -Infinity));
 134
 135 // Test cases taken from
 136 // https://github.com/mathiasbynens/String.prototype.startsWith/blob/master/tests/tests.js
 137 Object.prototype[1] = 2; // try to break `arguments[1]`
 138
 139 assertEquals(String.prototype.startsWith.length, 1);
 140 assertEquals(String.prototype.propertyIsEnumerable("startsWith"), false);
 141
 142 assertEquals("undefined".startsWith(), true);
 143 assertEquals("undefined".startsWith(undefined), true);
 144 assertEquals("undefined".startsWith(null), false);
 145 assertEquals("null".startsWith(), false);
 146 assertEquals("null".startsWith(undefined), false);
 147 assertEquals("null".startsWith(null), true);
 148
 149 assertEquals("abc".startsWith(), false);
 150 assertEquals("abc".startsWith(""), true);
 151 assertEquals("abc".startsWith("\0"), false);
 152 assertEquals("abc".startsWith("a"), true);
 153 assertEquals("abc".startsWith("b"), false);
 154 assertEquals("abc".startsWith("ab"), true);
 155 assertEquals("abc".startsWith("bc"), false);
 156 assertEquals("abc".startsWith("abc"), true);
 157 assertEquals("abc".startsWith("bcd"), false);
 158 assertEquals("abc".startsWith("abcd"), false);
 159 assertEquals("abc".startsWith("bcde"), false);
 160
 161 assertEquals("abc".startsWith("", NaN), true);
 162 assertEquals("abc".startsWith("\0", NaN), false);
 163 assertEquals("abc".startsWith("a", NaN), true);
 164 assertEquals("abc".startsWith("b", NaN), false);
 165 assertEquals("abc".startsWith("ab", NaN), true);
 166 assertEquals("abc".startsWith("bc", NaN), false);
 167 assertEquals("abc".startsWith("abc", NaN), true);
 168 assertEquals("abc".startsWith("bcd", NaN), false);
 169 assertEquals("abc".startsWith("abcd", NaN), false);
 170 assertEquals("abc".startsWith("bcde", NaN), false);
 171
 172 assertEquals("abc".startsWith("", false), true);
 173 assertEquals("abc".startsWith("\0", false), false);
 174 assertEquals("abc".startsWith("a", false), true);
 175 assertEquals("abc".startsWith("b", false), false);
 176 assertEquals("abc".startsWith("ab", false), true);
 177 assertEquals("abc".startsWith("bc", false), false);
 178 assertEquals("abc".startsWith("abc", false), true);
 179 assertEquals("abc".startsWith("bcd", false), false);
 180 assertEquals("abc".startsWith("abcd", false), false);
 181 assertEquals("abc".startsWith("bcde", false), false);
 182
 183 assertEquals("abc".startsWith("", undefined), true);
 184 assertEquals("abc".startsWith("\0", undefined), false);
 185 assertEquals("abc".startsWith("a", undefined), true);
 186 assertEquals("abc".startsWith("b", undefined), false);
 187 assertEquals("abc".startsWith("ab", undefined), true);
 188 assertEquals("abc".startsWith("bc", undefined), false);
 189 assertEquals("abc".startsWith("abc", undefined), true);
 190 assertEquals("abc".startsWith("bcd", undefined), false);
 191 assertEquals("abc".startsWith("abcd", undefined), false);
 192 assertEquals("abc".startsWith("bcde", undefined), false);
 193
 194 assertEquals("abc".startsWith("", null), true);
 195 assertEquals("abc".startsWith("\0", null), false);
 196 assertEquals("abc".startsWith("a", null), true);
 197 assertEquals("abc".startsWith("b", null), false);
 198 assertEquals("abc".startsWith("ab", null), true);
 199 assertEquals("abc".startsWith("bc", null), false);
 200 assertEquals("abc".startsWith("abc", null), true);
 201 assertEquals("abc".startsWith("bcd", null), false);
 202 assertEquals("abc".startsWith("abcd", null), false);
 203 assertEquals("abc".startsWith("bcde", null), false);
 204
 205 assertEquals("abc".startsWith("", -Infinity), true);
 206 assertEquals("abc".startsWith("\0", -Infinity), false);
 207 assertEquals("abc".startsWith("a", -Infinity), true);
 208 assertEquals("abc".startsWith("b", -Infinity), false);
 209 assertEquals("abc".startsWith("ab", -Infinity), true);
 210 assertEquals("abc".startsWith("bc", -Infinity), false);
 211 assertEquals("abc".startsWith("abc", -Infinity), true);
 212 assertEquals("abc".startsWith("bcd", -Infinity), false);
 213 assertEquals("abc".startsWith("abcd", -Infinity), false);
 214 assertEquals("abc".startsWith("bcde", -Infinity), false);
 215
 216 assertEquals("abc".startsWith("", -1), true);
 217 assertEquals("abc".startsWith("\0", -1), false);
 218 assertEquals("abc".startsWith("a", -1), true);
 219 assertEquals("abc".startsWith("b", -1), false);
 220 assertEquals("abc".startsWith("ab", -1), true);
 221 assertEquals("abc".startsWith("bc", -1), false);
 222 assertEquals("abc".startsWith("abc", -1), true);
 223 assertEquals("abc".startsWith("bcd", -1), false);
 224 assertEquals("abc".startsWith("abcd", -1), false);
 225 assertEquals("abc".startsWith("bcde", -1), false);
 226
 227 assertEquals("abc".startsWith("", -0), true);
 228 assertEquals("abc".startsWith("\0", -0), false);
 229 assertEquals("abc".startsWith("a", -0), true);
 230 assertEquals("abc".startsWith("b", -0), false);
 231 assertEquals("abc".startsWith("ab", -0), true);
 232 assertEquals("abc".startsWith("bc", -0), false);
 233 assertEquals("abc".startsWith("abc", -0), true);
 234 assertEquals("abc".startsWith("bcd", -0), false);
 235 assertEquals("abc".startsWith("abcd", -0), false);
 236 assertEquals("abc".startsWith("bcde", -0), false);
 237
 238 assertEquals("abc".startsWith("", +0), true);
 239 assertEquals("abc".startsWith("\0", +0), false);
 240 assertEquals("abc".startsWith("a", +0), true);
 241 assertEquals("abc".startsWith("b", +0), false);
 242 assertEquals("abc".startsWith("ab", +0), true);
 243 assertEquals("abc".startsWith("bc", +0), false);
 244 assertEquals("abc".startsWith("abc", +0), true);
 245 assertEquals("abc".startsWith("bcd", +0), false);
 246 assertEquals("abc".startsWith("abcd", +0), false);
 247 assertEquals("abc".startsWith("bcde", +0), false);
 248
 249 assertEquals("abc".startsWith("", 1), true);
 250 assertEquals("abc".startsWith("\0", 1), false);
 251 assertEquals("abc".startsWith("a", 1), false);
 252 assertEquals("abc".startsWith("b", 1), true);
 253 assertEquals("abc".startsWith("ab", 1), false);
 254 assertEquals("abc".startsWith("bc", 1), true);
 255 assertEquals("abc".startsWith("abc", 1), false);
 256 assertEquals("abc".startsWith("bcd", 1), false);
 257 assertEquals("abc".startsWith("abcd", 1), false);
 258 assertEquals("abc".startsWith("bcde", 1), false);
 259
 260 assertEquals("abc".startsWith("", +Infinity), true);
 261 assertEquals("abc".startsWith("\0", +Infinity), false);
 262 assertEquals("abc".startsWith("a", +Infinity), false);
 263 assertEquals("abc".startsWith("b", +Infinity), false);
 264 assertEquals("abc".startsWith("ab", +Infinity), false);
 265 assertEquals("abc".startsWith("bc", +Infinity), false);
 266 assertEquals("abc".startsWith("abc", +Infinity), false);
 267 assertEquals("abc".startsWith("bcd", +Infinity), false);
 268 assertEquals("abc".startsWith("abcd", +Infinity), false);
 269 assertEquals("abc".startsWith("bcde", +Infinity), false);
 270
 271 assertEquals("abc".startsWith("", true), true);
 272 assertEquals("abc".startsWith("\0", true), false);
 273 assertEquals("abc".startsWith("a", true), false);
 274 assertEquals("abc".startsWith("b", true), true);
 275 assertEquals("abc".startsWith("ab", true), false);
 276 assertEquals("abc".startsWith("bc", true), true);
 277 assertEquals("abc".startsWith("abc", true), false);
 278 assertEquals("abc".startsWith("bcd", true), false);
 279 assertEquals("abc".startsWith("abcd", true), false);
 280 assertEquals("abc".startsWith("bcde", true), false);
 281
 282 assertEquals("abc".startsWith("", "x"), true);
 283 assertEquals("abc".startsWith("\0", "x"), false);
 284 assertEquals("abc".startsWith("a", "x"), true);
 285 assertEquals("abc".startsWith("b", "x"), false);
 286 assertEquals("abc".startsWith("ab", "x"), true);
 287 assertEquals("abc".startsWith("bc", "x"), false);
 288 assertEquals("abc".startsWith("abc", "x"), true);
 289 assertEquals("abc".startsWith("bcd", "x"), false);
 290 assertEquals("abc".startsWith("abcd", "x"), false);
 291 assertEquals("abc".startsWith("bcde", "x"), false);
 292
 293 assertEquals("[a-z]+(bar)?".startsWith("[a-z]+"), true);
 294 assertThrows(function() { "[a-z]+(bar)?".startsWith(/[a-z]+/); }, TypeError);
 295 assertEquals("[a-z]+(bar)?".startsWith("(bar)?", 6), true);
 296 assertThrows(function() { "[a-z]+(bar)?".startsWith(/(bar)?/); }, TypeError);
 297 assertThrows(function() { "[a-z]+/(bar)?/".startsWith(/(bar)?/); }, TypeError);
 298
 299 // http://mathiasbynens.be/notes/javascript-unicode#poo-test
 300 var string = "I\xF1t\xEBrn\xE2ti\xF4n\xE0liz\xE6ti\xF8n\u2603\uD83D\uDCA9";
 301 assertEquals(string.startsWith(""), true);
 302 assertEquals(string.startsWith("\xF1t\xEBr"), false);
 303 assertEquals(string.startsWith("\xF1t\xEBr", 1), true);
 304 assertEquals(string.startsWith("\xE0liz\xE6"), false);
 305 assertEquals(string.startsWith("\xE0liz\xE6", 11), true);
 306 assertEquals(string.startsWith("\xF8n\u2603\uD83D\uDCA9"), false);
 307 assertEquals(string.startsWith("\xF8n\u2603\uD83D\uDCA9", 18), true);
 308 assertEquals(string.startsWith("\u2603"), false);
 309 assertEquals(string.startsWith("\u2603", 20), true);
 310 assertEquals(string.startsWith("\uD83D\uDCA9"), false);
 311 assertEquals(string.startsWith("\uD83D\uDCA9", 21), true);
 312
 313 assertThrows(function() {
 314   String.prototype.startsWith.call(undefined);
 315 }, TypeError);
 316 assertThrows(function() {
 317   String.prototype.startsWith.call(undefined, "b");
 318 }, TypeError);
 319 assertThrows(function() {
 320   String.prototype.startsWith.call(undefined, "b", 4);
 321 }, TypeError);
 322 assertThrows(function() {
 323   String.prototype.startsWith.call(null);
 324 }, TypeError);
 325 assertThrows(function() {
 326   String.prototype.startsWith.call(null, "b");
 327 }, TypeError);
 328 assertThrows(function() {
 329   String.prototype.startsWith.call(null, "b", 4);
 330 }, TypeError);
 331 assertEquals(String.prototype.startsWith.call(42, "2"), false);
 332 assertEquals(String.prototype.startsWith.call(42, "4"), true);
 333 assertEquals(String.prototype.startsWith.call(42, "b", 4), false);
 334 assertEquals(String.prototype.startsWith.call(42, "2", 1), true);
 335 assertEquals(String.prototype.startsWith.call(42, "2", 4), false);
 336 assertEquals(String.prototype.startsWith.call({
 337   "toString": function() { return "abc"; }
 338 }, "b", 0), false);
 339 assertEquals(String.prototype.startsWith.call({
 340   "toString": function() { return "abc"; }
 341 }, "b", 1), true);
 342 assertEquals(String.prototype.startsWith.call({
 343   "toString": function() { return "abc"; }
 344 }, "b", 2), false);
 345 assertThrows(function() {
 346   String.prototype.startsWith.call({
 347     "toString": function() { throw RangeError(); }
 348   }, /./);
 349 }, RangeError);
 350 assertThrows(function() {
 351   String.prototype.startsWith.call({
 352     "toString": function() { return "abc"; }
 353   }, /./);
 354 }, TypeError);
 355
 356 assertThrows(function() {
 357   String.prototype.startsWith.apply(undefined);
 358 }, TypeError);
 359 assertThrows(function() {
 360   String.prototype.startsWith.apply(undefined, ["b"]);
 361 }, TypeError);
 362 assertThrows(function() {
 363   String.prototype.startsWith.apply(undefined, ["b", 4]);
 364 }, TypeError);
 365 assertThrows(function() {
 366   String.prototype.startsWith.apply(null);
 367 }, TypeError);
 368 assertThrows(function() {
 369   String.prototype.startsWith.apply(null, ["b"]);
 370 }, TypeError);
 371 assertThrows(function() {
 372   String.prototype.startsWith.apply(null, ["b", 4]);
 373 }, TypeError);
 374 assertEquals(String.prototype.startsWith.apply(42, ["2"]), false);
 375 assertEquals(String.prototype.startsWith.apply(42, ["4"]), true);
 376 assertEquals(String.prototype.startsWith.apply(42, ["b", 4]), false);
 377 assertEquals(String.prototype.startsWith.apply(42, ["2", 1]), true);
 378 assertEquals(String.prototype.startsWith.apply(42, ["2", 4]), false);
 379 assertEquals(String.prototype.startsWith.apply({
 380   "toString": function() {
 381     return "abc";
 382   }
 383 }, ["b", 0]), false);
 384 assertEquals(String.prototype.startsWith.apply({
 385   "toString": function() {
 386     return "abc";
 387   }
 388 }, ["b", 1]), true);
 389 assertEquals(String.prototype.startsWith.apply({
 390   "toString": function() {
 391     return "abc";
 392   }
 393 }, ["b", 2]), false);
 394 assertThrows(function() {
 395   String.prototype.startsWith.apply({
 396     "toString": function() { throw RangeError(); }
 397   }, [/./]);
 398 }, RangeError);
 399 assertThrows(function() {
 400   String.prototype.startsWith.apply({
 401     "toString": function() { return "abc"; }
 402   }, [/./]);
 403 }, TypeError);