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+/* -*- tab-width: 2; indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+
+/**
+   File Name:          11.6.1-1.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 not cover cases where the Additive or Mulplicative expression
+   ToPrimitive is string.
+
+   Author:             christine@netscape.com
+   Date:               12 november 1997
+*/
+var SECTION = "11.6.1-1";
+var VERSION = "ECMA_1";
+startTest();
+
+writeHeaderToLog( SECTION + " The Addition operator ( + )");
+
+// tests for "MyValuelessObject", where the value is
+// set in the object's prototype, not the object itself.
+
+new TestCase(   SECTION,
+		"var EXP_1 = new MyValuelessObject(true); var EXP_2 = new MyValuelessObject(false); EXP_1 + EXP_2",
+		1,
+		eval("var EXP_1 = new MyValuelessObject(true); var EXP_2 = new MyValuelessObject(false); EXP_1 + EXP_2") );
+
+new TestCase(   SECTION,
+		"var EXP_1 = new MyValuelessObject(new Boolean(true)); var EXP_2 = new MyValuelessObject(new Boolean(false)); EXP_1 + EXP_2",
+		"truefalse",
+		eval("var EXP_1 = new MyValuelessObject(new Boolean(true)); var EXP_2 = new MyValuelessObject(new Boolean(false)); EXP_1 + EXP_2") );
+
+// tests for "MyValuelessObject", where the value is
+// set in the object's prototype, not the object itself.
+
+
+new TestCase(   SECTION,
+		"var EXP_1 = new MyValuelessObject(100); var EXP_2 = new MyValuelessObject(-1); EXP_1 + EXP_2",
+		99,
+		eval("var EXP_1 = new MyValuelessObject(100); var EXP_2 = new MyValuelessObject(-1); EXP_1 + EXP_2") );
+
+new TestCase(   SECTION,
+		"var EXP_1 = new MyValuelessObject(new Number(100)); var EXP_2 = new MyValuelessObject(new Number(-1)); EXP_1 + EXP_2",
+		"100-1",
+		eval("var EXP_1 = new MyValuelessObject(new Number(100)); var EXP_2 = new MyValuelessObject(new Number(-1)); EXP_1 + EXP_2") );
+
+new TestCase(   SECTION,
+		"var EXP_1 = new MyValuelessObject( new MyValuelessObject( new Boolean(true) ) ); EXP_1 + EXP_1",
+		"truetrue",
+		eval("var EXP_1 = new MyValuelessObject( new MyValuelessObject( new Boolean(true) ) ); EXP_1 + EXP_1") );
+
+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;
+}