1 files changed, 14 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/proxy/testDirectProxySet3.js b/js/src/jit-test/tests/proxy/testDirectProxySet3.js
new file mode 100644
index 000000000..94674aed6
--- /dev/null
+++ b/js/src/jit-test/tests/proxy/testDirectProxySet3.js
@@ -0,0 +1,14 @@
+load(libdir + "asserts.js");
+
+// Throw a TypeError if the trap sets a non-writable, non-configurable property
+for (var key of ['foo', Symbol.for('quux')]) {
+    var target = {};
+    Object.defineProperty(target, key, {
+        value: 'bar',
+        writable: false,
+        configurable: false
+    });
+    var handler = { set: () => true };
+    for (let p of [new Proxy(target, handler), Proxy.revocable(target, handler).proxy])
+        assertThrowsInstanceOf(() => p[key] = 'baz', TypeError);
+}