1 files changed, 37 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/RegExp/named-groups/groups-object-unmatched.js b/js/src/tests/test262/built-ins/RegExp/named-groups/groups-object-unmatched.js
new file mode 100644
index 0000000000..d43732eb06
--- /dev/null
+++ b/js/src/tests/test262/built-ins/RegExp/named-groups/groups-object-unmatched.js
@@ -0,0 +1,37 @@
+// Copyright 2017 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+  Test the groups object with matched and unmatched named captures.
+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 = /(?<a>a).|(?<x>x)/;
+const result = re.exec("ab");
+assert.sameValue(Object.getPrototypeOf(result), Array.prototype);
+assert(result.hasOwnProperty("groups"));
+assert.sameValue("ab", result[0]);
+assert.sameValue("a", result[1]);
+assert.sameValue(undefined, result[2]);
+assert.sameValue(0, result.index);
+assert.sameValue("a", result.groups.a);
+assert.sameValue(undefined, result.groups.x);
+
+// `a` is a matched named capture, `b` is an unmatched named capture, and `z`
+// is not a named capture.
+Array.prototype.groups = { a: "b", x: "y", z: "z" };
+assert.sameValue("a", "ab".replace(re, "$<a>"));
+assert.sameValue("", "ab".replace(re, "$<x>"));
+assert.sameValue("", "ab".replace(re, "$<z>"));
+Array.prototype.groups = undefined;
+
+reportCompare(0, 0);