| // String.prototype[@@iterator] and StringIterator.prototype surface tests |
| |
| load(libdir + "array-compare.js"); |
| load(libdir + "asserts.js"); |
| load(libdir + "iteration.js"); |
| |
| function assertDataDescriptor(actual, expected) { |
| assertEq(actual.value, expected.value); |
| assertEq(actual.writable, expected.writable); |
| assertEq(actual.enumerable, expected.enumerable); |
| assertEq(actual.configurable, expected.configurable); |
| } |
| |
| function isConstructor(o) { |
| try { |
| new (new Proxy(o, {construct: () => ({})})); |
| return true; |
| } catch(e) { |
| return false; |
| } |
| } |
| |
| function assertBuiltinFunction(o, name, arity) { |
| var fn = o[name]; |
| assertDataDescriptor(Object.getOwnPropertyDescriptor(o, name), { |
| value: fn, |
| writable: true, |
| enumerable: false, |
| configurable: true, |
| }); |
| |
| assertEq(typeof fn, "function"); |
| assertEq(Object.getPrototypeOf(fn), Function.prototype); |
| // FIXME: Proxy should only have [[Construct]] if target has [[Construct]] (bug 929467) |
| // assertEq(isConstructor(fn), false); |
| |
| arraysEqual(Object.getOwnPropertyNames(fn).sort(), ["length", "name", "arguments", "caller"].sort()); |
| |
| // Also test "name", "arguments" and "caller" in addition to "length"? |
| assertDataDescriptor(Object.getOwnPropertyDescriptor(fn, "length"), { |
| value: arity, |
| writable: false, |
| enumerable: false, |
| configurable: true |
| }); |
| } |
| |
| |
| // String.prototype[@@iterator] is a built-in function |
| assertBuiltinFunction(String.prototype, Symbol.iterator, 0); |
| |
| // Test StringIterator.prototype surface |
| var iter = ""[Symbol.iterator](); |
| var iterProto = Object.getPrototypeOf(iter); |
| |
| // StringIterator.prototype inherits from %IteratorPrototype%. Check it's the |
| // same object as %ArrayIteratorPrototype%'s proto. |
| assertEq(Object.getPrototypeOf(iterProto), |
| Object.getPrototypeOf(Object.getPrototypeOf([][Symbol.iterator]()))); |
| |
| // Own properties for StringIterator.prototype: "next" |
| arraysEqual(Object.getOwnPropertyNames(iterProto).sort(), ["next"]); |
| |
| // StringIterator.prototype.next is a built-in function |
| assertBuiltinFunction(iterProto, "next", 0); |
| |
| // StringIterator.prototype[@@iterator] is generic and returns |this| |
| for (var v of [void 0, null, true, false, "", 0, 1, {}, [], iter, iterProto]) { |
| assertEq(iterProto[Symbol.iterator].call(v), v); |
| } |
| |
| // StringIterator.prototype.next is not generic |
| for (var v of [void 0, null, true, false, "", 0, 1, {}, [], iterProto]) { |
| assertThrowsInstanceOf(() => iterProto.next.call(v), TypeError); |
| } |