[proxies] Update Object.defineProperty/ies for JSProxies

test/mjsunit/harmony/proxies-define-property.js

+// Copyright 2015 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-proxies
+
+// Check basic call to trap.
+
+var g_target, g_name, g_desc;
+var handler = {
+  defineProperty: function(target, name, desc) {
+    g_target = target;
+    g_name = name;
+    g_desc = desc;
+    return true;
+  }
+}
+var target = {}
+var proxy = new Proxy(target, handler);
+var desc = { value: 1, writable: true, configurable: true, enumerable: true };
+Object.defineProperty(proxy, "foo", desc);
+assertSame(target, g_target);
+assertEquals("foo", g_name);
+assertEquals(desc, g_desc);
+
+// Check specific steps in the spec:
+
+// Step 6: Trap isn't callable.
+handler.defineProperty = 1;
+assertThrows("Object.defineProperty(proxy, 'foo', {value: 2})");

[neis, 2015/11/17 21:37:40]

Here and below, check that it throws a TypeError.

[Jakob Kummerow, 2015/11/18 14:35:50]

Done.

+
+// Step 7: Trap is undefined.
+handler.defineProperty = undefined;
+Object.defineProperty(proxy, "prop1", desc);
+assertEquals(desc, Object.getOwnPropertyDescriptor(target, "prop1"));
+var target2 = {};
+var proxy2 = new Proxy(target2, {});
+Object.defineProperty(proxy2, "prop2", desc);
+assertEquals(desc, Object.getOwnPropertyDescriptor(target2, "prop2"));
+
+// Step 9: Property name is passed to the trap as a string.
+handler.defineProperty = function(t, name, d) { g_name = name; return true; };
+Object.defineProperty(proxy, 0, desc);
+assertTrue(typeof g_name === "string");
+assertEquals("0", g_name);
+
+// Step 10: Trap returns false.
+handler.defineProperty = function(t, n, d) { return false; }
+assertThrows("Object.defineProperty(proxy, 'foo', desc)");
+
+// Step 15a: Trap returns true for adding a property to a non-extensible target.
+handler.defineProperty = function(t, n, d) { return true; }
+Object.freeze(target);
+assertThrows("Object.defineProperty(proxy, 'foo', desc)");
+
+// Step 15b: Trap returns true for adding a non-configurable property.
+target = {};
+desc = {value: 1, writable: true, configurable: false, enumerable: true};
+assertThrows("Object.defineProperty(proxy, 'foo', desc)");

[neis, 2015/11/17 21:37:40]

Maybe also test the special case of this special case ("[...] unless there
exists a corresponding non-configurable own property of the target object.")

[Jakob Kummerow, 2015/11/18 14:35:50]

Done.

+
+// Step 16a: Trap returns true for non-compatible property descriptor.
+Object.defineProperty(target, "foo",
+                      {value: 1, writable: false, configurable: false});
+assertThrows("Object.defineProperty(proxy, 'foo', {value: 2})");
+
+// Step 16b: Trap returns true for overwriting a configurable property
+// with a non-configurable descriptor.
+target.bar = "baz";
+assertThrows("Object.defineProperty(proxy, 'bar', {configurable: false})");