1 files changed, 9 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/collections/WeakSet-add-returns-this.js b/js/src/jit-test/tests/collections/WeakSet-add-returns-this.js
new file mode 100644
index 0000000000..eb9c40e407
--- /dev/null
+++ b/js/src/jit-test/tests/collections/WeakSet-add-returns-this.js
@@ -0,0 +1,9 @@
+var ws = new WeakSet();
+var bar = {};
+assertEq(ws.add(bar), ws);
+var foo = {};
+var a = ws.add(foo);
+assertEq(a, ws);
+assertEq(a.has(bar), true);
+assertEq(a.has(foo), true);
+assertEq(WeakSet.prototype.add.call(ws, {}), ws);