Add Object.getOwnPropertyDescriptors test

test/built-ins/Object/getOwnPropertyDescriptors/order-after-define-property.js

@@ -0,0 +1,48 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-object.getownpropertydescriptors
+description: >
+  Property names are returned in ascending chronological order of creation
+  that is unaffected by [[DefineOwnProperty]].
+info: |
+  Object.getOwnPropertyDescriptors ( O )
+
+  [...]
+  2. Let ownKeys be ? obj.[[OwnPropertyKeys]]().
+  3. Let descriptors be ! OrdinaryObjectCreate(%Object.prototype%).
+  4. For each element key of ownKeys in List order, do
+    [...]
+    c. If descriptor is not undefined,
+    perform ! CreateDataPropertyOrThrow(descriptors, key, descriptor).
+  5. Return descriptors.
+
+  OrdinaryOwnPropertyKeys ( O )
+
+  [...]
+  3. For each own property key P of O that is a String but is not an array index,
+  in ascending chronological order of property creation, do
+    a. Add P as the last element of keys.
+  4. For each own property key P of O that is a Symbol, in ascending
+  chronological order of property creation, do
+    a. Add P as the last element of keys.
+  5. Return keys.
+features: [Symbol, Reflect]
+includes: [compareArray.js]
+---*/
+
+var obj = {};
+var symA = Symbol("a");
+var symB = Symbol("b");
+obj[symA] = 1;
+obj[symB] = 2;
+Object.defineProperty(obj, symA, {configurable: false});
+var objDescs = Object.getOwnPropertyDescriptors(obj);
+assert.compareArray(Reflect.ownKeys(objDescs), [symA, symB]);
+
+var re = /(?:)/g;
+re.a = 1;
+Object.defineProperty(re, "lastIndex", {value: 2});
+var reDescs = Object.getOwnPropertyDescriptors(re);
+assert.compareArray(Reflect.ownKeys(reDescs), ["lastIndex", "a"]);