1 files changed, 6 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/proxy/testDirectProxyPreventExtensions4.js b/js/src/jit-test/tests/proxy/testDirectProxyPreventExtensions4.js
new file mode 100644
index 0000000000..01395624e3
--- /dev/null
+++ b/js/src/jit-test/tests/proxy/testDirectProxyPreventExtensions4.js
@@ -0,0 +1,6 @@
+load(libdir + "asserts.js");
+
+// Throw a TypeError if the object refuses to be made non-extensible
+var handler = { preventExtensions: () => false };
+for (let p of [new Proxy({}, handler), Proxy.revocable({}, handler).proxy])
+    assertThrowsInstanceOf(() => Object.preventExtensions(p), TypeError);