Add for/in test

test/language/statements/for-in/order-after-define-property.js

@@ -0,0 +1,51 @@
+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-enumerate-object-properties
+description: >
+  Property names are returned in ascending chronological order of creation
+  that is unaffected by [[DefineOwnProperty]].
+info: |
+  EnumerateObjectProperties ( O )
+
+  EnumerateObjectProperties must obtain the own property keys of the target object
+  by calling its [[OwnPropertyKeys]] internal method. Property attributes of the
+  target object must be obtained by calling its [[GetOwnProperty]] internal method.
+
+  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.
+  [...]
+  5. Return keys.
+includes: [compareArray.js]
+---*/
+
+var obj = {};
+obj.a = 1;
+obj.b = 2;
+Object.defineProperty(obj, "a", {value: 11});
+var objKeys = [];
+for (var objKey in obj) {
+  objKeys.push(objKey);
+}
+assert.compareArray(objKeys, ["a", "b"]);
+
+var arr = [];
+Object.defineProperty(arr, "a", {
+  get: function() {},
+  enumerable: true,
+  configurable: true,
+})
+arr.b = 2;
+Object.defineProperty(arr, "a", {
+  get: function() {},
+});
+var arrKeys = [];
+for (var arrKey in arr) {
+  arrKeys.push(arrKey);
+}
+assert.compareArray(arrKeys, ["a", "b"]);