1 files changed, 9 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/proxy/testDirectProxyGetOwnPropertyDescriptor9.js b/js/src/jit-test/tests/proxy/testDirectProxyGetOwnPropertyDescriptor9.js
new file mode 100644
index 000000000..7a07f74f6
--- /dev/null
+++ b/js/src/jit-test/tests/proxy/testDirectProxyGetOwnPropertyDescriptor9.js
@@ -0,0 +1,9 @@
+load(libdir + "asserts.js");
+
+/*
+ * Throw a TypeError if the trap returns a non-configurable descriptor for a
+ * non-existent property
+ */
+var handler = { getOwnPropertyDescriptor: () => ({ configurable: false }) };
+for (let p of [new Proxy({}, handler), Proxy.revocable({}, handler).proxy])
+    assertThrowsInstanceOf(() => Object.getOwnPropertyDescriptor(p, 'foo'), TypeError);