Implemented Array.prototype.unshift().

JerryScript-DCO-1.0-Signed-off-by: Dániel Bátyai dbatyai.u-szeged@partner.samsung.com

tests/jerry/array_prototype_unshift.js

@@ -0,0 +1,104 @@
+// Copyright 2015 Samsung Electronics Co., Ltd.
+// Copyright 2015 University of Szeged.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+var array = []
+
+assert(array.length === 0);
+
+array.unshift("foo");
+assert(array.length === 1);
+assert(array[0] === "foo");
+
+array.unshift(new Array())
+assert(array.length === 2);
+assert(array[0] instanceof Array);
+assert(array[1] === "foo")
+
+array.unshift(Infinity);
+assert(array.length === 3);
+assert(array[0] === Infinity);
+assert(array[1] instanceof Array);
+assert(array[2] === "foo")
+
+array.unshift("bar", 0);
+assert(array.length === 5);
+assert(array[0] === "bar");
+assert(array[1] === 0);
+assert(array[2] === Infinity);
+assert(array[3] instanceof Array);
+assert(array[4] === "foo")
+
+
+// Checking behavior when no length property defined
+var obj = { unshift : Array.prototype.unshift };
+
+assert(obj.length === undefined);
+obj.unshift(1,2,3);
+assert(obj.length === 3);
+
+// Checking behavior when unable to get length
+var obj = { unshift : Array.prototype.unshift };
+Object.defineProperty(obj, 'length', { 'get' : function () {throw new ReferenceError ("foo"); } });
+
+try {
+	obj.unshift(1);
+	assert(false)
+} catch (e) {
+	assert(e.message === "foo");
+	assert(e instanceof ReferenceError);
+}
+
+// Checking behavior when unable to set length
+var obj = { unshift : Array.prototype.unshift };
+Object.defineProperty(obj, 'length', { 'set' : function () {throw new ReferenceError ("foo"); } });
+
+try {
+	obj.unshift(2);
+	assert(false)
+} catch (e) {
+	assert(e.message === "foo");
+	assert(e instanceof ReferenceError);
+}
+
+// Checking behavior when unable shift elements
+var obj = { unshift : Array.prototype.unshift, length : 1 };
+Object.defineProperty(obj, '0', { 'get' : function () {throw new ReferenceError ("foo"); } });
+
+try {
+	obj.unshift(3);
+	assert(false);
+} catch (e) {
+	assert(e.message === "foo");
+	assert(e instanceof ReferenceError);
+}
+
+var obj = { unshift : Array.prototype.unshift, length : 1 };
+Object.defineProperty(obj, '0', { 'set' : function () {throw new ReferenceError ("foo"); } });
+
+try {
+	obj.unshift(4);
+	assert(false);
+} catch (e) {
+	assert(e.message === "foo");
+	assert(e instanceof ReferenceError);
+}
+
+// Checking behavior when a property is not defined
+var obj = { '0' : "foo", '2' : "bar", length : 3, unshift : Array.prototype.unshift };
+assert(obj.unshift("baz") === 4);
+assert(obj[0] === "baz");
+assert(obj[1] === "foo");
+assert(obj[2] === undefined);
+assert(obj[3] === "bar");