async-iteration: add tests for AsyncIteratorPrototype

test/built-ins/AsyncIteratorPrototype/Symbol.asyncIterator/length.js

@@ -0,0 +1,29 @@
+// Copyright (C) 2018 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-asynciteratorprototype-asynciterator
+description: Length of AsyncIteratorPrototype[ @@asyncIterator ]
+info: |
+    ECMAScript Standard Built-in Objects
+    ...
+    Every built-in Function object, including constructors, has a length
+    property whose value is an integer. Unless otherwise specified, this value
+    is equal to the largest number of named arguments shown in the subclause
+    headings for the function description, including optional parameters.
+    ...
+    Unless otherwise specified, the length property of a built-in Function
+    object has the attributes { [[Writable]]: false, [[Enumerable]]: false,
+    [[Configurable]]: true }.
+features: [Symbol.asyncIterator, async-iteration]
+includes: [propertyHelper.js]
+---*/
+
+async function* generator() {}
+var AsyncIteratorPrototype = Object.getPrototypeOf(Object.getPrototypeOf(generator.prototype))
+
+verifyProperty(AsyncIteratorPrototype[Symbol.asyncIterator], "length", {
+  value: 0,
+  enumerable: false,
+  writable: false,
+  configurable: true,
+});

test/built-ins/AsyncIteratorPrototype/Symbol.asyncIterator/name.js

@@ -0,0 +1,33 @@
+// Copyright (C) 2018 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-asynciteratorprototype-asynciterator
+description: Descriptor for `name` property
+info: |
+  %AsyncIteratorPrototype% [ @@asyncIterator ] ( )
+  ...
+  The value of the name property of this function is "[Symbol.asyncIterator]".
+
+  ECMAScript Standard Built-in Objects
+  ...
+  Every built-in Function object, including constructors, that is not
+  identified as an anonymous function has a name property whose value is a
+  String. Unless otherwise specified, this value is the name that is given to
+  the function in this specification.
+  ...
+  Unless otherwise specified, the name property of a built-in Function
+  object, if it exists, has the attributes { [[Writable]]: false,
+  [[Enumerable]]: false, [[Configurable]]: true }.
+features: [Symbol.asyncIterator, async-iteration]
+includes: [propertyHelper.js]
+---*/
+
+async function* generator() {}
+var AsyncIteratorPrototype = Object.getPrototypeOf(Object.getPrototypeOf(generator.prototype))
+
+verifyProperty(AsyncIteratorPrototype[Symbol.asyncIterator], "name", {
+  value: '[Symbol.asyncIterator]',
+  enumerable: false,
+  writable: false,
+  configurable: true,
+});

test/built-ins/AsyncIteratorPrototype/Symbol.asyncIterator/prop-desc.js

@@ -0,0 +1,26 @@
+// Copyright (C) 2018 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: sec-asynciteratorprototype
+description: Property descriptor
+info: |
+    ECMAScript Standard Built-in Objects
+
+    Every other data property described in clauses 18 through 26 and in Annex
+    B.2 has the attributes { [[Writable]]: true, [[Enumerable]]: false,
+    [[Configurable]]: true } unless otherwise specified.
+features: [Symbol.asyncIterator, async-iteration]
+includes: [propertyHelper.js]
+---*/
+
+async function* generator() {}
+var AsyncIteratorPrototype = Object.getPrototypeOf(Object.getPrototypeOf(generator.prototype))
+
+assert.sameValue(typeof AsyncIteratorPrototype[Symbol.asyncIterator], 'function');
+
+verifyProperty(AsyncIteratorPrototype, Symbol.asyncIterator, {
+  enumerable: false,
+  writable: true,
+  configurable: true,
+});
+

test/built-ins/AsyncIteratorPrototype/Symbol.asyncIterator/return-val.js

@@ -0,0 +1,20 @@
+// Copyright (C) 2018 Valerie Young. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: sec-asynciteratorprototype-asynciterator
+description: Return value of @@asyncIterator
+info: |
+  %AsyncIteratorPrototype% [ @@asyncIterator ] ( )
+    1. Return the this value.
+features: [Symbol.asyncIterator, async-iteration]
+---*/
+
+async function* generator() {}
+var AsyncIteratorPrototype = Object.getPrototypeOf(Object.getPrototypeOf(generator.prototype))
+
+var thisValue = {};
+
+assert.sameValue(
+  AsyncIteratorPrototype[Symbol.asyncIterator].call(thisValue),
+  thisValue
+);