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comparison: js/src/jit-test/tests/for-of/string-iterator-surfaces.js
js/src/jit-test/tests/for-of/string-iterator-surfaces.js
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
equal
deleted
inserted
replaced
| -1:000000000000 | 0:f39e4135d559 |
|---|---|
| 1 // String.prototype[@@iterator] and StringIterator.prototype surface tests | |
| 2 | |
| 3 load(libdir + "array-compare.js"); | |
| 4 load(libdir + "asserts.js"); | |
| 5 load(libdir + "iteration.js"); | |
| 6 | |
| 7 function assertDataDescriptor(actual, expected) { | |
| 8 assertEq(actual.value, expected.value); | |
| 9 assertEq(actual.writable, expected.writable); | |
| 10 assertEq(actual.enumerable, expected.enumerable); | |
| 11 assertEq(actual.configurable, expected.configurable); | |
| 12 } | |
| 13 | |
| 14 function isConstructor(o) { | |
| 15 try { | |
| 16 new (new Proxy(o, {construct: () => ({})})); | |
| 17 return true; | |
| 18 } catch(e) { | |
| 19 return false; | |
| 20 } | |
| 21 } | |
| 22 | |
| 23 function assertBuiltinFunction(o, name, arity) { | |
| 24 var fn = o[name]; | |
| 25 assertDataDescriptor(Object.getOwnPropertyDescriptor(o, name), { | |
| 26 value: fn, | |
| 27 writable: true, | |
| 28 enumerable: false, | |
| 29 configurable: true, | |
| 30 }); | |
| 31 | |
| 32 assertEq(typeof fn, "function"); | |
| 33 assertEq(Object.getPrototypeOf(fn), Function.prototype); | |
| 34 // FIXME: Proxy should only have [[Construct]] if target has [[Construct]] (bug 929467) | |
| 35 // assertEq(isConstructor(fn), false); | |
| 36 | |
| 37 arraysEqual(Object.getOwnPropertyNames(fn).sort(), ["length", "name", "arguments", "caller"].sort()); | |
| 38 | |
| 39 // Also test "name", "arguments" and "caller" in addition to "length"? | |
| 40 assertDataDescriptor(Object.getOwnPropertyDescriptor(fn, "length"), { | |
| 41 value: arity, | |
| 42 writable: false, | |
| 43 enumerable: false, | |
| 44 configurable: false, | |
| 45 }); | |
| 46 } | |
| 47 | |
| 48 | |
| 49 // String.prototype[@@iterator] is a built-in function | |
| 50 assertBuiltinFunction(String.prototype, std_iterator, 0); | |
| 51 | |
| 52 // Test StringIterator.prototype surface | |
| 53 var iter = ""[std_iterator](); | |
| 54 var iterProto = Object.getPrototypeOf(iter); | |
| 55 | |
| 56 // StringIterator.prototype inherits from Object.prototype | |
| 57 assertEq(Object.getPrototypeOf(iterProto), Object.prototype); | |
| 58 | |
| 59 // Own properties for StringIterator.prototype: "next" and @@iterator | |
| 60 arraysEqual(Object.getOwnPropertyNames(iterProto).sort(), ["next", std_iterator].sort()); | |
| 61 | |
| 62 // StringIterator.prototype[@@iterator] is a built-in function | |
| 63 assertBuiltinFunction(iterProto, std_iterator, 0); | |
| 64 | |
| 65 // StringIterator.prototype.next is a built-in function | |
| 66 assertBuiltinFunction(iterProto, "next", 0); | |
| 67 | |
| 68 // StringIterator.prototype[@@iterator] is generic and returns |this| | |
| 69 for (var v of [void 0, null, true, false, "", 0, 1, {}, [], iter, iterProto]) { | |
| 70 assertEq(iterProto[std_iterator].call(v), v); | |
| 71 } | |
| 72 | |
| 73 // StringIterator.prototype.next is not generic | |
| 74 for (var v of [void 0, null, true, false, "", 0, 1, {}, [], iterProto]) { | |
| 75 assertThrowsInstanceOf(() => iterProto.next.call(v), TypeError); | |
| 76 } |
