1 files changed, 36 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Object/assign/source-own-prop-desc-missing.js b/js/src/tests/test262/built-ins/Object/assign/source-own-prop-desc-missing.js
new file mode 100644
index 0000000000..54fc0dbe66
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Object/assign/source-own-prop-desc-missing.js
@@ -0,0 +1,36 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 19.1.2.1
+description: Invoked with a source which does not have a descriptor for an own property
+info: |
+    [...]
+    5. For each element nextSource of sources, in ascending index order,
+       [...]
+       c. Repeat for each element nextKey of keys in List order,
+          i. Let desc be from.[[GetOwnProperty]](nextKey).
+          ii. ReturnIfAbrupt(desc).
+          iii. if desc is not undefined and desc.[[Enumerable]] is true, then
+features: [Proxy]
+---*/
+
+var callCount = 0;
+var target = {};
+var result;
+var source = new Proxy({}, {
+  ownKeys: function() {
+    callCount += 1;
+    return ['missing'];
+  }
+});
+
+result = Object.assign(target, source);
+
+assert.sameValue(callCount, 1, 'Proxy trap was invoked exactly once');
+assert(
+  !Object.prototype.hasOwnProperty.call(target, 'missing'),
+  'An own property was not created for a property without a property descriptor'
+);
+assert.sameValue(result, target);
+
+reportCompare(0, 0);