1 files changed, 7 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/proxy/testDirectProxyPreventExtensions3.js b/js/src/jit-test/tests/proxy/testDirectProxyPreventExtensions3.js
new file mode 100644
index 000000000..7cb404618
--- /dev/null
+++ b/js/src/jit-test/tests/proxy/testDirectProxyPreventExtensions3.js
@@ -0,0 +1,7 @@
+load(libdir + "asserts.js");
+
+// Throw a TypeError if the trap reports an extensible object as non-extensible
+
+var handler = { preventExtensions: () => true };
+for (let p of [new Proxy({}, handler), Proxy.revocable({}, handler).proxy])
+    assertThrowsInstanceOf(() => Object.preventExtensions(p), TypeError);