Bug 1317389: Change property attributes for generator and async functions to match ES2015/2017.

Tag #1287

1 files changed, 111 insertions, 0 deletions

diff --git a/js/src/tests/ecma_6/Generators/properties.js b/js/src/tests/ecma_6/Generators/properties.js
new file mode 100644
index 000000000..7782e64c0
--- /dev/null
+++ b/js/src/tests/ecma_6/Generators/properties.js
@@ -0,0 +1,111 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+function assertOwnDescriptor(object, propertyKey, expected) {
+  var desc = Object.getOwnPropertyDescriptor(object, propertyKey);
+  if (desc === undefined) {
+    assertEq(expected, undefined, "Property shouldn't be present");
+    return;
+  }
+
+  assertEq(desc.enumerable, expected.enumerable, `${String(propertyKey)}.[[Enumerable]]`);
+  assertEq(desc.configurable, expected.configurable, `${String(propertyKey)}.[[Configurable]]`);
+
+  if (Object.prototype.hasOwnProperty.call(desc, "value")) {
+    assertEq(desc.value, expected.value, `${String(propertyKey)}.[[Value]]`);
+    assertEq(desc.writable, expected.writable, `${String(propertyKey)}.[[Writable]]`);
+  } else {
+    assertEq(desc.get, expected.get, `${String(propertyKey)}.[[Get]]`);
+    assertEq(desc.set, expected.set, `${String(propertyKey)}.[[Set]]`);
+  }
+}
+
+function* generator(){}
+var GeneratorFunctionPrototype = Object.getPrototypeOf(generator);
+var GeneratorFunction = GeneratorFunctionPrototype.constructor;
+var GeneratorPrototype = GeneratorFunctionPrototype.prototype;
+
+
+// ES2017, 25.2.2 Properties of the GeneratorFunction Constructor
+
+assertEqArray(Object.getOwnPropertyNames(GeneratorFunction).sort(), ["length", "name", "prototype"]);
+assertEqArray(Object.getOwnPropertySymbols(GeneratorFunction), []);
+
+assertOwnDescriptor(GeneratorFunction, "length", {
+    value: 1, writable: false, enumerable: false, configurable: true
+});
+
+assertOwnDescriptor(GeneratorFunction, "name", {
+    value: "GeneratorFunction", writable: false, enumerable: false, configurable: true
+});
+
+assertOwnDescriptor(GeneratorFunction, "prototype", {
+    value: GeneratorFunctionPrototype, writable: false, enumerable: false, configurable: false
+});
+
+
+// ES2017, 25.2.3 Properties of the GeneratorFunction Prototype Object
+
+assertEqArray(Object.getOwnPropertyNames(GeneratorFunctionPrototype).sort(), ["constructor", "prototype"]);
+assertEqArray(Object.getOwnPropertySymbols(GeneratorFunctionPrototype), [Symbol.toStringTag]);
+
+assertOwnDescriptor(GeneratorFunctionPrototype, "constructor", {
+    value: GeneratorFunction, writable: false, enumerable: false, configurable: true
+});
+
+assertOwnDescriptor(GeneratorFunctionPrototype, "prototype", {
+    value: GeneratorPrototype, writable: false, enumerable: false, configurable: true
+});
+
+assertOwnDescriptor(GeneratorFunctionPrototype, Symbol.toStringTag, {
+    value: "GeneratorFunction", writable: false, enumerable: false, configurable: true
+});
+
+
+// ES2017, 25.2.4 GeneratorFunction Instances
+
+assertEqArray(Object.getOwnPropertyNames(generator).sort(), ["length", "name", "prototype"]);
+assertEqArray(Object.getOwnPropertySymbols(generator), []);
+
+assertOwnDescriptor(generator, "length", {
+    value: 0, writable: false, enumerable: false, configurable: true
+});
+
+assertOwnDescriptor(generator, "name", {
+    value: "generator", writable: false, enumerable: false, configurable: true
+});
+
+assertOwnDescriptor(generator, "prototype", {
+    value: generator.prototype, writable: true, enumerable: false, configurable: false
+});
+
+
+// ES2017, 25.3.1 Properties of Generator Prototype
+
+assertEqArray(Object.getOwnPropertyNames(GeneratorPrototype).sort(), ["constructor", "next", "return", "throw"]);
+assertEqArray(Object.getOwnPropertySymbols(GeneratorPrototype), [Symbol.toStringTag]);
+
+assertOwnDescriptor(GeneratorPrototype, "constructor", {
+    value: GeneratorFunctionPrototype, writable: false, enumerable: false, configurable: true
+});
+
+assertOwnDescriptor(GeneratorPrototype, "next", {
+    value: GeneratorPrototype.next, writable: true, enumerable: false, configurable: true
+});
+
+assertOwnDescriptor(GeneratorPrototype, "return", {
+    value: GeneratorPrototype.return, writable: true, enumerable: false, configurable: true
+});
+
+assertOwnDescriptor(GeneratorPrototype, "throw", {
+    value: GeneratorPrototype.throw, writable: true, enumerable: false, configurable: true
+});
+
+assertOwnDescriptor(GeneratorPrototype, Symbol.toStringTag, {
+    value: "Generator", writable: false, enumerable: false, configurable: true
+});
+
+
+if (typeof reportCompare == "function")
+    reportCompare(true, true);