tests/mozilla/ecma_2/Expressions/instanceof-002.js

   1 /**
   2     File Name:          instanceof-002.js
   3     Section:
   4     Description:        Determining Instance Relationships
   5
   6     This test is the same as js1_3/inherit/proto-002, except that it uses
   7     the builtin instanceof operator rather than a user-defined function
   8     called InstanceOf.
   9
  10     This tests Object Hierarchy and Inheritance, as described in the document
  11     Object Hierarchy and Inheritance in JavaScript, last modified on 12/18/97
  12     15:19:34 on http://devedge.netscape.com/.  Current URL:
  13     http://devedge.netscape.com/docs/manuals/communicator/jsobj/contents.htm
  14
  15     This tests the syntax ObjectName.prototype = new PrototypeObject using the
  16     Employee example in the document referenced above.
  17
  18     Author:             christine@netscape.com
  19     Date:               12 november 1997
  20 */
  21 //    onerror = err;
  22
  23     var SECTION = "instanceof-002";
  24     var VERSION = "ECMA_2";
  25     var TITLE   = "Determining Instance Relationships";
  26
  27     startTest();
  28     writeHeaderToLog( SECTION + " "+ TITLE);
  29
  30     var tc = 0;
  31     var testcases = new Array();
  32
  33 function InstanceOf( object, constructor ) {
  34     while ( object != null ) {
  35         if ( object == constructor.prototype ) {
  36             return true;
  37         }
  38         object = object.__proto__;
  39     }
  40     return false;
  41 }
  42
  43 function Employee ( name, dept ) {
  44      this.name = name || "";
  45      this.dept = dept || "general";
  46 }
  47
  48 function Manager () {
  49      this.reports = [];
  50 }
  51 Manager.prototype = new Employee();
  52
  53 function WorkerBee ( name, dept, projs ) {
  54     this.base = Employee;
  55     this.base( name, dept)
  56     this.projects = projs || new Array();
  57 }
  58 WorkerBee.prototype = new Employee();
  59
  60 function SalesPerson () {
  61     this.dept = "sales";
  62     this.quota = 100;
  63 }
  64 SalesPerson.prototype = new WorkerBee();
  65
  66 function Engineer ( name, projs, machine ) {
  67     this.base = WorkerBee;
  68     this.base( name, "engineering", projs )
  69     this.machine = machine || "";
  70 }
  71 Engineer.prototype = new WorkerBee();
  72
  73 var pat = new Engineer()
  74
  75     testcases[tc++] = new TestCase( SECTION,
  76                                     "pat.__proto__ == Engineer.prototype",
  77                                     true,
  78                                     pat.__proto__ == Engineer.prototype );
  79
  80     testcases[tc++] = new TestCase( SECTION,
  81                                     "pat.__proto__.__proto__ == WorkerBee.prototype",
  82                                     true,
  83                                     pat.__proto__.__proto__ == WorkerBee.prototype );
  84
  85     testcases[tc++] = new TestCase( SECTION,
  86                                     "pat.__proto__.__proto__.__proto__ == Employee.prototype",
  87                                     true,
  88                                     pat.__proto__.__proto__.__proto__ == Employee.prototype );
  89
  90     testcases[tc++] = new TestCase( SECTION,
  91                                     "pat.__proto__.__proto__.__proto__.__proto__ == Object.prototype",
  92                                     true,
  93                                     pat.__proto__.__proto__.__proto__.__proto__ == Object.prototype );
  94
  95     testcases[tc++] = new TestCase( SECTION,
  96                                     "pat.__proto__.__proto__.__proto__.__proto__.__proto__ == null",
  97                                     true,
  98                                     pat.__proto__.__proto__.__proto__.__proto__.__proto__ == null );
  99
 100     testcases[tc++] = new TestCase( SECTION,
 101                                     "pat instanceof Engineer",
 102                                     true,
 103                                     pat instanceof Engineer );
 104
 105     testcases[tc++] = new TestCase( SECTION,
 106                                     "pat instanceof WorkerBee )",
 107                                     true,
 108                                      pat instanceof WorkerBee );
 109
 110     testcases[tc++] = new TestCase( SECTION,
 111                                     "pat instanceof Employee )",
 112                                     true,
 113                                      pat instanceof Employee );
 114
 115     testcases[tc++] = new TestCase( SECTION,
 116                                     "pat instanceof Object )",
 117                                     true,
 118                                      pat instanceof Object );
 119
 120     testcases[tc++] = new TestCase( SECTION,
 121                                     "pat instanceof SalesPerson )",
 122                                     false,
 123                                      pat instanceof SalesPerson );
 124     test();