Add m-esr52 at 52.6.0

1 files changed, 19 insertions, 0 deletions

diff --git a/js/src/jit-test/tests/proxy/testDirectProxyValidateProperty1.js b/js/src/jit-test/tests/proxy/testDirectProxyValidateProperty1.js
new file mode 100644
index 000000000..d2c9c18c9
--- /dev/null
+++ b/js/src/jit-test/tests/proxy/testDirectProxyValidateProperty1.js
@@ -0,0 +1,19 @@
+load(libdir + "asserts.js");
+
+/*
+ * Throw a TypeError if the current descriptor is non-configurable and the trap
+ * returns a configurable descriptor
+ */
+var target = {};
+Object.defineProperty(target, 'foo', {
+    configurable: false
+});
+assertThrowsInstanceOf(function () {
+    Object.getOwnPropertyDescriptor(Proxy(target, {
+        getOwnPropertyDescriptor: function (target, name) {
+            return {
+                configurable: true
+            };
+        }
+    }), 'foo');
+}, TypeError);