Merge branch 'add-json-proxy-testcase'

tests/ecmascript/test-bi-json-enc-proxy.js

@@ -0,0 +1,59 @@
+/*
+ *  Stringifying a Proxy should consult the underlying object.
+ */
+
+/*===
+{"foo":234}
+{"foo":345}
+===*/
+
+function jsonStringifyProxyTest() {
+    var target, proxy, obj;
+
+    // Here keys to be enumerated are from the target object.
+    // (Verified to behave the same way with Firefox.)
+    target = { foo: 123 };
+    proxy = new Proxy(target, { get: function () { return 234; } });
+    print(JSON.stringify(proxy));
+
+    // Inherited properties are not enumerated.
+    // (Verified to behave the same way with Firefox.)
+    obj = { bar: 234 };  // not serialized
+    target = Object.create(obj);
+    target.foo = 123;  // serialized
+    proxy = new Proxy(target, { get: function () { return 345; } });
+    print(JSON.stringify(proxy));
+
+    // 'keys' trap is invoked to figure out keys to serialize
+    // - JSON.stringify() calls internal function: http://www.ecma-international.org/ecma-262/6.0/#sec-serializejsonobject
+    // - SerializeJSONObject() calls internal function: http://www.ecma-international.org/ecma-262/6.0/#sec-enumerableownnames
+    // - EnumerableOwnNames() calls O.[[OwnPropertyKeys]]
+    // - Proxy [[OwnPropertyKeys]] calls 'ownKeys' trap: http://www.ecma-international.org/ecma-262/6.0/#sec-proxy-object-internal-methods-and-internal-slots-ownpropertykeys
+    // - XXX: must go through the post-processing to ensure the testcase is correct
+
+    /* XXX: this test is disabled until the proper expect string is in place
+
+    target = { foo: 123, bar: 234, quux: 345 };
+    proxy = new Proxy(target, {
+        get: function (targ, key, recv) {
+            return 'key-' + key;
+        },
+        enumerate: function () {
+            print('enumerate should not be called');
+            return [];
+        },
+        ownKeys: function () {
+            // ownKeys is called to decide what properties to serialize
+            print('ownKeys should be called');
+            return [ 'foo', 'quux', 'baz' ];
+        }
+    });
+    print(JSON.stringify(proxy));
+    */
+}
+
+try {
+    jsonStringifyProxyTest();
+} catch (e) {
+    print(e.stack || e);
+}