1 files changed, 16 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/proxy/testDirectProxyDefineProperty6.js b/js/src/jit-test/tests/proxy/testDirectProxyDefineProperty6.js
new file mode 100644
index 000000000..9818257e0
--- /dev/null
+++ b/js/src/jit-test/tests/proxy/testDirectProxyDefineProperty6.js
@@ -0,0 +1,16 @@
+// Bug 1133094 - Proxy.[[DefineOwnProperty]]() should not throw when asked to
+// define a configurable accessor property over an existing configurable data
+// property on the target, even if the trap leaves the target unchanged.
+
+var hits = 0;
+var p = new Proxy({x: 1}, {
+    defineProperty(t, k, desc) {
+        // don't bother redefining the existing property t.x
+        hits++;
+        return true;
+    }
+});
+
+assertEq(Object.defineProperty(p, "x", {get: function () {}}), p);
+assertEq(hits, 1);
+assertEq(p.x, 1);