Add m-esr52 at 52.6.0

1 files changed, 23 insertions, 0 deletions

diff --git a/js/src/jit-test/tests/proxy/testDirectProxyKeys10.js b/js/src/jit-test/tests/proxy/testDirectProxyKeys10.js
new file mode 100644
index 000000000..47a4360aa
--- /dev/null
+++ b/js/src/jit-test/tests/proxy/testDirectProxyKeys10.js
@@ -0,0 +1,23 @@
+load(libdir + "asserts.js");
+
+// Allow [[GetOwnPropertyDescriptor]] to spoof enumerability of target object's
+// properties. Note that this also tests that the getOwnPropertyDescriptor is
+// called by Object.keys(), as expected.
+
+var target = {};
+var handler = {
+    getOwnPropertyDescriptor : function (target, P) {
+        var targetDesc = Object.getOwnPropertyDescriptor(target, P);
+        // Lie about enumerability
+        targetDesc.enumerable = !targetDesc.enumerable;
+        return targetDesc;
+    }
+};
+
+for (let p of [new Proxy(target, handler), Proxy.revocable(target, handler).proxy]) {
+    Object.defineProperty(target, "foo", { configurable: true, enumerable: false });
+    assertDeepEq(Object.keys(p), ["foo"]);
+
+    Object.defineProperty(target, "foo", {configurable: true, enumerable: true});
+    assertDeepEq(Object.keys(p), []);
+}