1 files changed, 41 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/RegExp/match-indices/indices-groups-object.js b/js/src/tests/test262/built-ins/RegExp/match-indices/indices-groups-object.js
new file mode 100644
index 0000000000..41fa94412f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/RegExp/match-indices/indices-groups-object.js
@@ -0,0 +1,41 @@
+// Copyright 2019 Ron Buckton. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: The groups object of indices is created with CreateDataProperty
+includes: [propertyHelper.js, compareArray.js]
+esid: sec-makeindicesarray
+features: [regexp-named-groups, regexp-match-indices]
+info: |
+  MakeIndicesArray ( S, indices, groupNames, hasIndices )
+    10. If _hasIndices_ is *true*, then
+      a. Let _groups_ be ! ObjectCreate(*null*).
+    11. Else,
+      a. Let _groups_ be *undefined*.
+    12. Perform ! CreateDataProperty(_A_, `"groups"`, _groups_).
+---*/
+
+// `groups` is created with Define, not Set.
+let counter = 0;
+Object.defineProperty(Array.prototype, "groups", {
+  set() { counter++; }
+});
+
+let indices = /(?<x>.)/d.exec("a").indices;
+assert.sameValue(counter, 0);
+
+// `groups` is writable, enumerable and configurable
+// (from CreateDataProperty).
+verifyProperty(indices, 'groups', {
+    writable: true,
+    enumerable: true,
+    configurable: true
+});
+
+// The `__proto__` property on the groups object is not special,
+// and does not affect the [[Prototype]] of the resulting groups object.
+let {groups} = /(?<__proto__>.)/d.exec("a").indices;
+assert.compareArray([0, 1], groups.__proto__);
+assert.sameValue(null, Object.getPrototypeOf(groups));
+
+reportCompare(0, 0);