Implement Proxy object [[DefineOwnProperty]] internal method (#3662)

The algorithm is based on ECMA-262 v6, 9.5.6

JerryScript-DCO-1.0-Signed-off-by: Adam Szilagyi aszilagy@inf.u-szeged.hu

tests/jerry/es2015/proxy_define_own_property.js

@@ -12,7 +12,9 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// TODO: Update these tests when the internal routine has been implemented
+// 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.
 
 var target = function () {};
 var handler = { defineProperty (target) {
@@ -25,3 +27,150 @@ var proxy = new Proxy(target, handler);
 
 // 22.1.2.3.8.c
 Array.of.call(proxy, 5)
+
+// test basic functionality
+var g_target, g_name;
+
+var handler = {
+  defineProperty: function(target, name, desc) {
+    g_target = target;
+    g_name = name;
+    return true;
+  }
+}
+
+var target = {};
+var proxy = new Proxy(target, handler);
+var desc = { value: 1, writable: true, configurable: true };
+
+Object.defineProperty(proxy, "foo", desc);
+
+assert(target === g_target);
+assert("foo" === g_name);
+
+var handler = {
+  defineProperty: function(target, name, desc) {
+    Object.defineProperty(target, name, desc);
+  }
+}
+
+var proxy = new Proxy(target, handler);
+
+Object.defineProperty(proxy, "bar", desc);
+
+assert(proxy.bar === 1);
+
+/* TODO - remove this comment when [[GetOwnProperty]] is implemented
+proxy.bar = 2;
+assert(proxy.bar === 2);
+*/
+
+delete proxy.bar;
+assert(proxy.bar === undefined);
+
+/* TODO - remove this comment when [[GetOwnProperty]] is implemented
+Object.defineProperty(proxy, "name", {
+  get() {
+    return this._name;
+  },
+  set(value) {
+    this._name = value;
+  }
+});
+
+proxy.name = "foo";
+
+assert(proxy.name === "foo");
+assert(target.name === "foo");
+*/
+
+// test when trap is not callable
+var target = {};
+var handler = {
+  defineProperty: 1
+}
+
+var proxy = new Proxy(target, handler);
+
+try {
+  Object.defineProperty(proxy, "foo", {value: "foo"});
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}
+
+// test when trap is undefined
+var target = {};
+var handler = {
+  defineProperty: undefined
+}
+
+var proxy = new Proxy(target, handler);
+var desc = { value: 1 };
+
+Object.defineProperty(proxy, "prop1", desc);
+assert(proxy.prop1 === 1);
+
+var target2 = {};
+var proxy2 = new Proxy(target2, {});
+
+Object.defineProperty(proxy2, "prop2", desc);
+assert(proxy2.prop2 === 1);
+
+// test when invariants gets violated
+var target = {};
+var handler = {
+  defineProperty: function(target, name, desc) {
+    return true;
+  }
+}
+
+var proxy = new Proxy(target, handler);
+
+Object.preventExtensions(target);
+
+try {
+  Object.defineProperty(proxy, "foo", {value: 1});
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}
+
+var target = {};
+var desc = {value: 1, writable: true, configurable: false, enumerable: true};
+
+var proxy = new Proxy(target, handler);
+
+try {
+  Object.defineProperty(proxy, "foo", desc);
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}
+
+var target = {};
+var handler = {
+  defineProperty: function(target, name, desc) {
+    return true;
+  }
+}
+
+var proxy = new Proxy(target, handler);
+
+Object.defineProperty(target, "foo", {value: 1, writable: false, configurable: false});
+
+try {
+  Object.defineProperty(proxy, 'foo', {value: 2});
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}
+
+target.bar = "baz";
+
+try {
+  Object.defineProperty(proxy, 'bar', {value: 2, configurable: false});
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}