pjs/js/tests/ecma_2/extensions/instanceof-002.js

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gTestfile = 'instanceof-002.js';

/**
   File Name:          instanceof-002.js
   Section:
   Description:        Determining Instance Relationships

   This test is the same as js1_3/inherit/proto-002, except that it uses
   the builtin instanceof operator rather than a user-defined function
   called InstanceOf.

   This tests Object Hierarchy and Inheritance, as described in the document
   Object Hierarchy and Inheritance in JavaScript, last modified on 12/18/97
   15:19:34 on http://devedge.netscape.com/.  Current URL:
   http://devedge.netscape.com/docs/manuals/communicator/jsobj/contents.htm

   This tests the syntax ObjectName.prototype = new PrototypeObject using the
   Employee example in the document referenced above.

   Author:             christine@netscape.com
   Date:               12 november 1997
*/
//    onerror = err;

var SECTION = "instanceof-002";
var VERSION = "ECMA_2";
var TITLE   = "Determining Instance Relationships";

startTest();
writeHeaderToLog( SECTION + " "+ TITLE);

function InstanceOf( object, constructor ) {
  while ( object != null ) {
    if ( object == constructor.prototype ) {
      return true;
    }
    object = object.__proto__;
  }
  return false;
}

function Employee ( name, dept ) {
  this.name = name || "";
  this.dept = dept || "general";
}

function Manager () {
  this.reports = [];
}
Manager.prototype = new Employee();

function WorkerBee ( name, dept, projs ) {
  this.base = Employee;
  this.base( name, dept)
    this.projects = projs || new Array();
}
WorkerBee.prototype = new Employee();

function SalesPerson () {
  this.dept = "sales";
  this.quota = 100;
}
SalesPerson.prototype = new WorkerBee();

function Engineer ( name, projs, machine ) {
  this.base = WorkerBee;
  this.base( name, "engineering", projs )
    this.machine = machine || "";
}
Engineer.prototype = new WorkerBee();

var pat = new Engineer();

new TestCase( SECTION,
	      "pat.__proto__ == Engineer.prototype",
	      true,
	      pat.__proto__ == Engineer.prototype );

new TestCase( SECTION,
	      "pat.__proto__.__proto__ == WorkerBee.prototype",
	      true,
	      pat.__proto__.__proto__ == WorkerBee.prototype );

new TestCase( SECTION,
	      "pat.__proto__.__proto__.__proto__ == Employee.prototype",
	      true,
	      pat.__proto__.__proto__.__proto__ == Employee.prototype );

new TestCase( SECTION,
	      "pat.__proto__.__proto__.__proto__.__proto__ == Object.prototype",
	      true,
	      pat.__proto__.__proto__.__proto__.__proto__ == Object.prototype );

new TestCase( SECTION,
	      "pat.__proto__.__proto__.__proto__.__proto__.__proto__ == null",
	      true,
	      pat.__proto__.__proto__.__proto__.__proto__.__proto__ == null );

new TestCase( SECTION,
	      "pat instanceof Engineer",
	      true,
	      pat instanceof Engineer );

new TestCase( SECTION,
	      "pat instanceof WorkerBee )",
	      true,
	      pat instanceof WorkerBee );

new TestCase( SECTION,
	      "pat instanceof Employee )",
	      true,
	      pat instanceof Employee );

new TestCase( SECTION,
	      "pat instanceof Object )",
	      true,
	      pat instanceof Object );

new TestCase( SECTION,
	      "pat instanceof SalesPerson )",
	      false,
	      pat instanceof SalesPerson );
test();