1 files changed, 27 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/statements/for-in/order-property-added.js b/js/src/tests/test262/language/statements/for-in/order-property-added.js
new file mode 100644
index 0000000000..54ab4b19f5
--- /dev/null
+++ b/js/src/tests/test262/language/statements/for-in/order-property-added.js
@@ -0,0 +1,27 @@
+// Copyright 2019 Kevin Gibbons. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-enumerate-object-properties
+description: Properties added to the object during iteration are not enumerated
+features: [for-in-order]
+includes: [compareArray.js]
+---*/
+
+var o = {
+  p1: 'p1',
+  p2: 'p2',
+  p3: 'p3',
+};
+
+var keys = [];
+for (var key in o) {
+  if (key === 'p1') {
+    o.p4 = 'p4';
+  }
+  keys.push(key);
+}
+
+assert.compareArray(keys, ['p1', 'p2', 'p3']);
+
+reportCompare(0, 0);