Add m-esr52 at 52.6.0

1 files changed, 28 insertions, 0 deletions

diff --git a/js/src/jit-test/tests/proxy/testDirectProxyValidateProperty7.js b/js/src/jit-test/tests/proxy/testDirectProxyValidateProperty7.js
new file mode 100644
index 000000000..3c945c131
--- /dev/null
+++ b/js/src/jit-test/tests/proxy/testDirectProxyValidateProperty7.js
@@ -0,0 +1,28 @@
+load(libdir + "asserts.js");
+
+/*
+ * Throw a TypeError if both the current descriptor and the descriptor returned
+ * by the trap are accessor descriptors, the current descriptor is
+ * non-configurable, and the descriptor returned by the trap has a different
+ * getter.
+ */
+var target = {};
+Object.defineProperty(target, 'foo', {
+    get: function () {
+        return 'bar';
+    },
+    configurable: false
+});
+var caught = false;
+assertThrowsInstanceOf(function () { 
+    Object.getOwnPropertyDescriptor(new Proxy(target, {
+        getOwnPropertyDescriptor: function (target, name) {
+            return {
+                get: function () {
+                    return 'baz';
+                },
+                configurable: false
+            };
+        }
+    }), 'foo');
+}, TypeError);