1 files changed, 40 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/concat/create-species-undef.js b/js/src/tests/test262/built-ins/Array/prototype/concat/create-species-undef.js
new file mode 100644
index 0000000000..0c64e02017
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Array/prototype/concat/create-species-undef.js
@@ -0,0 +1,40 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-array.prototype.concat
+description: >
+    An undefined value for the @@species constructor triggers the creation  of
+    an Array exotic object
+info: |
+    [...]
+    9. Let A be ? ArraySpeciesCreate(O, actualDeleteCount).
+    [...]
+
+    9.4.2.3 ArraySpeciesCreate
+
+    [...]
+    5. Let C be ? Get(originalArray, "constructor").
+    [...]
+    7. If Type(C) is Object, then
+       a. Let C be ? Get(C, @@species).
+       b. If C is null, let C be undefined.
+    8. If C is undefined, return ? ArrayCreate(length).
+features: [Symbol.species]
+---*/
+
+var a = [];
+var result;
+
+a.constructor = {};
+a.constructor[Symbol.species] = undefined;
+
+result = a.concat();
+
+assert.sameValue(
+  Object.getPrototypeOf(result),
+  Array.prototype,
+  'Object.getPrototypeOf(a.concat()) returns Array.prototype'
+);
+assert(Array.isArray(result), 'Array.isArray(result) must return true');
+
+reportCompare(0, 0);