Add m-esr52 at 52.6.0

1 files changed, 14 insertions, 0 deletions

diff --git a/js/src/jit-test/tests/proxy/testDirectProxyGetOwnPropertyDescriptor4.js b/js/src/jit-test/tests/proxy/testDirectProxyGetOwnPropertyDescriptor4.js
new file mode 100644
index 000000000..9920121f2
--- /dev/null
+++ b/js/src/jit-test/tests/proxy/testDirectProxyGetOwnPropertyDescriptor4.js
@@ -0,0 +1,14 @@
+load(libdir + "asserts.js");
+
+/*
+ * Throw a TypeError if the trap reports a non-configurable property as
+ * non-existent
+ */
+var target = {};
+Object.defineProperty(target, 'foo', {
+    configurable: false
+});
+
+var handler = { getOwnPropertyDescriptor: () => undefined };
+for (let p of [new Proxy(target, handler), Proxy.revocable(target, handler).proxy])
+    assertThrowsInstanceOf(() => Object.getOwnPropertyDescriptor(p, 'foo'), TypeError);