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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (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.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Communicator client code, released
+ * March 31, 1998.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1998
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+gTestfile = '11.6.1-3.js';
+
+/**
+   File Name:          11.6.1-3.js
+   ECMA Section:       11.6.1 The addition operator ( + )
+   Description:
+
+   The addition operator either performs string concatenation or numeric
+   addition.
+
+   The production AdditiveExpression : AdditiveExpression + MultiplicativeExpression
+   is evaluated as follows:
+
+   1.  Evaluate AdditiveExpression.
+   2.  Call GetValue(Result(1)).
+   3.  Evaluate MultiplicativeExpression.
+   4.  Call GetValue(Result(3)).
+   5.  Call ToPrimitive(Result(2)).
+   6.  Call ToPrimitive(Result(4)).
+   7.  If Type(Result(5)) is String or Type(Result(6)) is String, go to step 12.
+   (Note that this step differs from step 3 in the algorithm for comparison
+   for the relational operators in using or instead of and.)
+   8.  Call ToNumber(Result(5)).
+   9.  Call ToNumber(Result(6)).
+   10. Apply the addition operation to Result(8) and Result(9). See the discussion below (11.6.3).
+   11. Return Result(10).
+   12. Call ToString(Result(5)).
+   13. Call ToString(Result(6)).
+   14. Concatenate Result(12) followed by Result(13).
+   15. Return Result(14).
+
+   Note that no hint is provided in the calls to ToPrimitive in steps 5 and 6.
+   All native ECMAScript objects except Date objects handle the absence of a
+   hint as if the hint Number were given; Date objects handle the absence of a
+   hint as if the hint String were given. Host objects may handle the absence
+   of a hint in some other manner.
+
+   This test does only covers cases where the Additive or Mulplicative expression
+   is a Date.
+
+   Author:             christine@netscape.com
+   Date:               12 november 1997
+*/
+var SECTION = "11.6.1-3";
+var VERSION = "ECMA_1";
+startTest();
+
+writeHeaderToLog( SECTION + " The Addition operator ( + )");
+
+// tests for a boolean primitive and a boolean object, and
+// "MyValuelessObject", where the value is set in the object's
+// prototype, not the object itself.
+
+var DATE1 = new Date();
+
+var MYOB1 = new MyObject( DATE1 );
+var MYOB2 = new MyValuelessObject( DATE1 );
+var MYOB3 = new MyProtolessObject( DATE1 );
+var MYOB4 = new MyProtoValuelessObject( DATE1 );
+
+new TestCase(   SECTION,
+                "MYOB2 = new MyValuelessObject(DATE1); MYOB3 + 'string'",
+                DATE1.toString() + "string",
+                MYOB2 + 'string' );
+
+new TestCase(   SECTION,
+                "MYOB2 = new MyValuelessObject(DATE1); MYOB3 + new String('string')",
+                DATE1.toString() + "string",
+                MYOB2 + new String('string') );
+/*
+  new TestCase(   SECTION,
+  "MYOB3 = new MyProtolessObject(DATE1); MYOB3 + new Boolean(true)",
+  DATE1.toString() + "true",
+  MYOB3 + new Boolean(true) );
+*/
+
+test();
+
+function MyProtoValuelessObject() {
+  this.valueOf = new Function ( "" );
+  this.__proto__ = null;
+}
+function MyProtolessObject( value ) {
+  this.valueOf = new Function( "return this.value" );
+  this.__proto__ = null;
+  this.value = value;
+}
+function MyValuelessObject(value) {
+  this.__proto__ = new MyPrototypeObject(value);
+}
+function MyPrototypeObject(value) {
+  this.valueOf = new Function( "return this.value;" );
+  this.toString = new Function( "return (this.value + '');" );
+  this.value = value;
+}
+function MyObject( value ) {
+  this.valueOf = new Function( "return this.value" );
+  this.value = value;
+}