deps/v8/test/mjsunit/es6/string-startswith.js

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  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);