Add m-esr52 at 52.6.0

1 files changed, 52 insertions, 0 deletions

diff --git a/js/src/tests/ecma_6/Symbol/enumeration.js b/js/src/tests/ecma_6/Symbol/enumeration.js
new file mode 100644
index 000000000..e7ca426e6
--- /dev/null
+++ b/js/src/tests/ecma_6/Symbol/enumeration.js
@@ -0,0 +1,52 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/ */
+
+// for-in loops skip properties with symbol keys, even enumerable properties.
+var obj = {};
+obj[Symbol.for("moon")] = "sun";
+obj[Symbol("asleep")] = "awake";
+obj[Symbol.iterator] = "List";
+for (var x in obj)
+    throw "FAIL: " + uneval(x);
+
+// This includes inherited properties.
+var obj2 = Object.create(obj);
+for (var x in obj2)
+    throw "FAIL: " + uneval(x);
+
+// The same goes for proxies.
+var p = new Proxy(obj, {});
+for (var x in p)
+    throw "FAIL: " + uneval(x);
+var p2 = new Proxy(obj2, {});
+for (var x in p2)
+    throw "FAIL: " + uneval(x);
+
+// Object.keys() and .getOwnPropertyNames() also skip symbols.
+assertEq(Object.keys(obj).length, 0);
+assertEq(Object.keys(p).length, 0);
+assertEq(Object.keys(obj2).length, 0);
+assertEq(Object.keys(p2).length, 0);
+assertEq(Object.getOwnPropertyNames(obj).length, 0);
+assertEq(Object.getOwnPropertyNames(p).length, 0);
+assertEq(Object.getOwnPropertyNames(obj2).length, 0);
+assertEq(Object.getOwnPropertyNames(p2).length, 0);
+
+// Test interaction of Object.keys(), proxies, and symbol property keys.
+var log = [];
+var h = {
+    ownKeys: (t) => {
+        log.push("ownKeys");
+        return ["a", "0", Symbol.for("moon"), Symbol("asleep"), Symbol.iterator];
+    },
+    getOwnPropertyDescriptor: (t, key) => {
+        log.push("gopd", key);
+        return {configurable: true, enumerable: true, value: 0, writable: true};
+    }
+};
+p = new Proxy({}, h);
+assertDeepEq(Object.keys(p), ["a", "0"]);
+assertDeepEq(log, ["ownKeys", "gopd", "a", "gopd", "0"]);
+
+if (typeof reportCompare === "function")
+    reportCompare(0, 0);