1 files changed, 35 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/RegExp/named-groups/groups-object-undefined.js b/js/src/tests/test262/built-ins/RegExp/named-groups/groups-object-undefined.js
new file mode 100644
index 0000000000..06f5e49454
--- /dev/null
+++ b/js/src/tests/test262/built-ins/RegExp/named-groups/groups-object-undefined.js
@@ -0,0 +1,35 @@
+// Copyright 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: The groups object is created unconditionally.
+includes: [propertyHelper.js]
+esid: sec-regexpbuiltinexec
+features: [regexp-named-groups]
+info: |
+  Runtime Semantics: RegExpBuiltinExec ( R, S )
+    24. If _R_ contains any |GroupName|, then
+      a. Let _groups_ be ObjectCreate(*null*).
+    25. Else,
+      a. Let _groups_ be *undefined*.
+    26. Perform ! CreateDataProperty(_A_, `"groups"`, _groups_).
+---*/
+
+const re = /./;
+const result = re.exec("a");
+assert.sameValue(Object.getPrototypeOf(result), Array.prototype);
+assert(result.hasOwnProperty("groups"));
+assert.sameValue("a", result[0]);
+assert.sameValue(0, result.index);
+assert.sameValue(undefined, result.groups);
+verifyProperty(result, "groups", {
+  writable: true,
+  enumerable: true,
+  configurable: true,
+});
+
+Array.prototype.groups = { a: "b" };
+assert.sameValue("$<a>", "a".replace(re, "$<a>"));
+Array.prototype.groups = undefined;
+
+reportCompare(0, 0);