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      1 // Copyright 2014 the V8 project authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 
      6 function TestStringPrototypeIterator() {
      7   assertTrue(String.prototype.hasOwnProperty(Symbol.iterator));
      8   assertFalse("".hasOwnProperty(Symbol.iterator));
      9   assertFalse("".propertyIsEnumerable(Symbol.iterator));
     10 }
     11 TestStringPrototypeIterator();
     12 
     13 
     14 function assertIteratorResult(value, done, result) {
     15   assertEquals({value: value, done: done}, result);
     16 }
     17 
     18 
     19 function TestManualIteration() {
     20   var string = "abc";
     21   var iterator = string[Symbol.iterator]();
     22   assertIteratorResult('a', false, iterator.next());
     23   assertIteratorResult('b', false, iterator.next());
     24   assertIteratorResult('c', false, iterator.next());
     25   assertIteratorResult(void 0, true, iterator.next());
     26   assertIteratorResult(void 0, true, iterator.next());
     27 }
     28 TestManualIteration();
     29 
     30 
     31 function TestSurrogatePairs() {
     32   var lo = "\uD834";
     33   var hi = "\uDF06";
     34   var pair = lo + hi;
     35   var string = "abc" + pair + "def" + lo + pair + hi + lo;
     36   var iterator = string[Symbol.iterator]();
     37   assertIteratorResult('a', false, iterator.next());
     38   assertIteratorResult('b', false, iterator.next());
     39   assertIteratorResult('c', false, iterator.next());
     40   assertIteratorResult(pair, false, iterator.next());
     41   assertIteratorResult('d', false, iterator.next());
     42   assertIteratorResult('e', false, iterator.next());
     43   assertIteratorResult('f', false, iterator.next());
     44   assertIteratorResult(lo, false, iterator.next());
     45   assertIteratorResult(pair, false, iterator.next());
     46   assertIteratorResult(hi, false, iterator.next());
     47   assertIteratorResult(lo, false, iterator.next());
     48   assertIteratorResult(void 0, true, iterator.next());
     49   assertIteratorResult(void 0, true, iterator.next());
     50 }
     51 TestSurrogatePairs();
     52 
     53 
     54 function TestStringIteratorPrototype() {
     55   var iterator = ""[Symbol.iterator]();
     56   var StringIteratorPrototype = iterator.__proto__;
     57   assertFalse(StringIteratorPrototype.hasOwnProperty('constructor'));
     58   assertEquals(StringIteratorPrototype.__proto__, Object.prototype);
     59   assertArrayEquals(['next'],
     60       Object.getOwnPropertyNames(StringIteratorPrototype));
     61   assertEquals('[object String Iterator]', "" + iterator);
     62 }
     63 TestStringIteratorPrototype();
     64 
     65 
     66 function TestForOf() {
     67   var lo = "\uD834";
     68   var hi = "\uDF06";
     69   var pair = lo + hi;
     70   var string = "abc" + pair + "def" + lo + pair + hi + lo;
     71   var expected = ['a', 'b', 'c', pair, 'd', 'e', 'f', lo, pair, hi, lo];
     72 
     73   var i = 0;
     74   for (var char of string) {
     75     assertEquals(expected[i++], char);
     76   }
     77 
     78   assertEquals(expected.length, i);
     79 }
     80 TestForOf();
     81 
     82 
     83 function TestNonOwnSlots() {
     84   var iterator = ""[Symbol.iterator]();
     85   var object = {__proto__: iterator};
     86 
     87   assertThrows(function() { object.next(); }, TypeError);
     88 }
     89 TestNonOwnSlots();
     90