1 files changed, 19 insertions, 0 deletions
diff --git a/js/src/tests/non262/Proxy/define-writable-as-non-writable.js b/js/src/tests/non262/Proxy/define-writable-as-non-writable.js
new file mode 100644
index 0000000000..f764d278f0
--- /dev/null
+++ b/js/src/tests/non262/Proxy/define-writable-as-non-writable.js
@@ -0,0 +1,19 @@
+"use strict";
+
+var target = {};
+Object.defineProperty(target, "test", {configurable: false, writable: true, value: 5});
+
+var proxy = new Proxy(target, {
+    defineProperty(target, property) {
+        assertEq(property, "test");
+        return true;
+    }
+});
+
+assertThrowsInstanceOf(
+    () => Object.defineProperty(proxy, "test", {writable: false}), TypeError);
+
+assertThrowsInstanceOf(
+    () => Reflect.defineProperty(proxy, "test", {writable: false}), TypeError);
+
+reportCompare(0, 0);