Add m-esr52 at 52.6.0

1 files changed, 54 insertions, 0 deletions

diff --git a/js/src/tests/ecma_6/Object/defineProperty-proxy.js b/js/src/tests/ecma_6/Object/defineProperty-proxy.js
new file mode 100644
index 000000000..b5ece940b
--- /dev/null
+++ b/js/src/tests/ecma_6/Object/defineProperty-proxy.js
@@ -0,0 +1,54 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/ */
+
+// Test details of the implementation of ToPropertyDescriptor exposed to scripts
+// thanks to scriptable proxies.
+
+// A LoggingProxy object logs certain operations performed on it.
+var log = [];
+function LoggingProxy(target) {
+    return new Proxy(target, {
+        has: function (t, id) {
+            log.push("has " + id);
+            return id in t;
+        },
+        get: function (t, id) {
+            log.push("get " + id);
+            return t[id];
+        }
+    });
+}
+
+// Tragically, we use separate code to implement Object.defineProperty on
+// arrays and on proxies. So run the test three times.
+var testSubjects = [
+    {},
+    [],
+    new Proxy({}, {})
+];
+
+for (var obj of testSubjects) {
+    log = [];
+
+    // Object.defineProperty is one public method that performs a
+    // ToPropertyDescriptor call.
+    Object.defineProperty(obj, "x", new LoggingProxy({
+        enumerable: true,
+        configurable: true,
+        value: 3,
+        writable: true
+    }));
+
+    // It should have performed exactly these operations on the proxy, in this
+    // order. See ES6 rev 24 (2014 April 27) 6.2.4.5 ToPropertyDescriptor.
+    assertDeepEq(log, [
+        "has enumerable", "get enumerable",
+        "has configurable", "get configurable",
+        "has value", "get value",
+        "has writable", "get writable",
+        "has get",
+        "has set"
+    ]);
+}
+
+reportCompare(0, 0);