Add m-esr52 at 52.6.0

1 files changed, 15 insertions, 0 deletions

diff --git a/js/src/jit-test/tests/proxy/testDirectProxyGetOwnPropertyDescriptor5.js b/js/src/jit-test/tests/proxy/testDirectProxyGetOwnPropertyDescriptor5.js
new file mode 100644
index 000000000..0d3334680
--- /dev/null
+++ b/js/src/jit-test/tests/proxy/testDirectProxyGetOwnPropertyDescriptor5.js
@@ -0,0 +1,15 @@
+load(libdir + "asserts.js");
+
+/*
+ * Throw a TypeError if the trap reports an existing own property as
+ * non-existent on a non-extensible object
+ */
+var target = {};
+Object.defineProperty(target, 'foo', {
+    configurable: true
+});
+Object.preventExtensions(target);
+
+var handler = { getOwnPropertyDescriptor: () => undefined };
+for (let p of [new Proxy(target, handler), Proxy.revocable(target, handler).proxy])
+    assertThrowsInstanceOf(() => Object.getOwnPropertyDescriptor(p, 'foo'), TypeError);