1 files changed, 21 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/proxy/testDirectProxySetArray3.js b/js/src/jit-test/tests/proxy/testDirectProxySetArray3.js
new file mode 100644
index 0000000000..44bbcd99b4
--- /dev/null
+++ b/js/src/jit-test/tests/proxy/testDirectProxySetArray3.js
@@ -0,0 +1,21 @@
+// Assigning to the length property of a proxy to an array
+// calls the proxy's defineProperty handler.
+
+var a = [0, 1, 2, 3];
+var p = new Proxy(a, {
+    defineProperty(t, id, desc) {
+        hits++;
+
+        // ES6 draft rev 28 (2014 Oct 14) 9.1.9 step 5.e.i.
+        // Since the property already exists, the system only changes
+        // the value. desc is otherwise empty.
+        assertEq(Object.getOwnPropertyNames(desc).join(","), "value");
+        assertEq(desc.value, 2);
+        return true;
+    }
+});
+var hits = 0;
+p.length = 2;
+assertEq(hits, 1);
+assertEq(a.length, 4);
+assertEq(a[2], 2);