text: $(document).ready(function() {
  
    module("Backbone.Model");
  
    // Variable to catch the last request.
    window.lastRequest = null;
  
    window.originalSync = Backbone.sync;
  
    // Stub out Backbone.request...
    Backbone.sync = function() {
      lastRequest = _.toArray(arguments);
    };
  
    var attrs = {
      id     : '1-the-tempest',
      title  : "The Tempest",
      author : "Bill Shakespeare",
      length : 123
    };
  
    var proxy = Backbone.Model.extend();
    var doc = new proxy(attrs);
  
    var klass = Backbone.Collection.extend({
      url : function() { return '/collection'; }
    });
  
    var collection = new klass();
    collection.add(doc);
  
    test("Model: initialize", function() {
      var Model = Backbone.Model.extend({
        initialize: function() {
          this.one = 1;
          equals(this.collection, collection);
        }
      });
      var model = new Model({}, {collection: collection});
      equals(model.one, 1);
      equals(model.collection, collection);
    });
  
    test("Model: initialize with attributes and options", function() {
      var Model = Backbone.Model.extend({
        initialize: function(attributes, options) {
          this.one = options.one;
        }
      });
      var model = new Model({}, {one: 1});
      equals(model.one, 1);
    });
  
    test("Model: url", function() {
      equals(doc.url(), '/collection/1-the-tempest');
      doc.collection.url = '/collection/';
      equals(doc.url(), '/collection/1-the-tempest');
      doc.collection = null;
      var failed = false;
      try {
        doc.url();
      } catch (e) {
        failed = true;
      }
      equals(failed, true);
      doc.collection = collection;
    });
  
    test("Model: url when using urlRoot, and uri encoding", function() {
      var Model = Backbone.Model.extend({
        urlRoot: '/collection'
      });
      var model = new Model();
      equals(model.url(), '/collection');
      model.set({id: '+1+'});
      equals(model.url(), '/collection/%2B1%2B');
    });
  
    test("Model: clone", function() {
      attrs = { 'foo': 1, 'bar': 2, 'baz': 3};
      a = new Backbone.Model(attrs);
      b = a.clone();
      equals(a.get('foo'), 1);
      equals(a.get('bar'), 2);
      equals(a.get('baz'), 3);
      equals(b.get('foo'), a.get('foo'), "Foo should be the same on the clone.");
      equals(b.get('bar'), a.get('bar'), "Bar should be the same on the clone.");
      equals(b.get('baz'), a.get('baz'), "Baz should be the same on the clone.");
      a.set({foo : 100});
      equals(a.get('foo'), 100);
      equals(b.get('foo'), 1, "Changing a parent attribute does not change the clone.");
    });
  
    test("Model: isNew", function() {
      attrs = { 'foo': 1, 'bar': 2, 'baz': 3};
      a = new Backbone.Model(attrs);
      ok(a.isNew(), "it should be new");
      attrs = { 'foo': 1, 'bar': 2, 'baz': 3, 'id': -5 };
      ok(a.isNew(), "any defined ID is legal, negative or positive");
    });
  
    test("Model: get", function() {
      equals(doc.get('title'), 'The Tempest');
      equals(doc.get('author'), 'Bill Shakespeare');
    });
  
    test("Model: escape", function() {
      equals(doc.escape('title'), 'The Tempest');
      doc.set({audience: 'Bill & Bob'});
      equals(doc.escape('audience'), 'Bill &amp; Bob');
      doc.set({audience: 'Tim > Joan'});
      equals(doc.escape('audience'), 'Tim &gt; Joan');
      doc.set({audience: 10101});
      equals(doc.escape('audience'), '10101');
      doc.unset('audience');
      equals(doc.escape('audience'), '');
    });
  
    test("Model: has", function() {
      attrs = {};
      a = new Backbone.Model(attrs);
      equals(a.has("name"), false);
      _([true, "Truth!", 1, false, '', 0]).each(function(value) {
        a.set({'name': value});
        equals(a.has("name"), true);
      });
      a.unset('name');
      equals(a.has('name'), false);
      _([null, undefined]).each(function(value) {
        a.set({'name': value});
        equals(a.has("name"), false);
      });
    });
  
    test("Model: set and unset", function() {
      attrs = {id: 'id', foo: 1, bar: 2, baz: 3};
      a = new Backbone.Model(attrs);
      var changeCount = 0;
      a.bind("change:foo", function() { changeCount += 1; });
      a.set({'foo': 2});
      ok(a.get('foo')== 2, "Foo should have changed.");
      ok(changeCount == 1, "Change count should have incremented.");
      a.set({'foo': 2}); // set with value that is not new shouldn't fire change event
      ok(a.get('foo')== 2, "Foo should NOT have changed, still 2");
      ok(changeCount == 1, "Change count should NOT have incremented.");
  
      a.unset('foo');
      ok(a.get('foo')== null, "Foo should have changed");
      ok(changeCount == 2, "Change count should have incremented for unset.");
  
      a.unset('id');
      equals(a.id, undefined, "Unsetting the id should remove the id property.");
    });
  
    test("Model: multiple unsets", function() {
      var i = 0;
      var counter = function(){ i++; };
      var model = new Backbone.Model({a: 1});
      model.bind("change:a", counter);
      model.set({a: 2});
      model.unset('a');
      model.unset('a');
      equals(i, 2, 'Unset does not fire an event for missing attributes.');
    });
  
    test("Model: using a non-default id attribute.", function() {
      var MongoModel = Backbone.Model.extend({idAttribute : '_id'});
      var model = new MongoModel({id: 'eye-dee', _id: 25, title: 'Model'});
      equals(model.get('id'), 'eye-dee');
      equals(model.id, 25);
      model.unset('_id');
      equals(model.id, undefined);
    });
  
    test("Model: set an empty string", function() {
      var model = new Backbone.Model({name : "Model"});
      model.set({name : ''});
      equals(model.get('name'), '');
    });
  
    test("Model: clear", function() {
      var changed;
      var model = new Backbone.Model({name : "Model"});
      model.bind("change:name", function(){ changed = true; });
      model.clear();
      equals(changed, true);
      equals(model.get('name'), undefined);
    });
  
    test("Model: defaults", function() {
      var Defaulted = Backbone.Model.extend({
        defaults: {
          "one": 1,
          "two": 2
        }
      });
      var model = new Defaulted({two: null});
      equals(model.get('one'), 1);
      equals(model.get('two'), null);
      Defaulted = Backbone.Model.extend({
        defaults: function() {
          return {
            "one": 3,
            "two": 4
          };
        }
      });
      var model = new Defaulted({two: null});
      equals(model.get('one'), 3);
      equals(model.get('two'), null);
    });
  
    test("Model: change, hasChanged, changedAttributes, previous, previousAttributes", function() {
      var model = new Backbone.Model({name : "Tim", age : 10});
      equals(model.changedAttributes(), false);
      model.bind('change', function() {
        ok(model.hasChanged('name'), 'name changed');
        ok(!model.hasChanged('age'), 'age did not');
        ok(_.isEqual(model.changedAttributes(), {name : 'Rob'}), 'changedAttributes returns the changed attrs');
        equals(model.previous('name'), 'Tim');
        ok(_.isEqual(model.previousAttributes(), {name : "Tim", age : 10}), 'previousAttributes is correct');
      });
      model.set({name : 'Rob'}, {silent : true});
      equals(model.hasChanged(), true);
      equals(model.hasChanged('name'), true);
      model.change();
      equals(model.get('name'), 'Rob');
    });
  
    test("Model: change with options", function() {
      var value;
      var model = new Backbone.Model({name: 'Rob'});
      model.bind('change', function(model, options) {
        value = options.prefix + model.get('name');
      });
      model.set({name: 'Bob'}, {silent: true});
      model.change({prefix: 'Mr. '});
      equals(value, 'Mr. Bob');
      model.set({name: 'Sue'}, {prefix: 'Ms. '});
      equals(value, 'Ms. Sue');
    });
  
    test("Model: change after initialize", function () {
      var changed = 0;
      var attrs = {id: 1, label: 'c'};
      var obj = new Backbone.Model(attrs);
      obj.bind('change', function() { changed += 1; });
      obj.set(attrs);
      equals(changed, 0);
    });
  
    test("Model: save within change event", function () {
      var model = new Backbone.Model({firstName : "Taylor", lastName: "Swift"});
      model.bind('change', function () {
        model.save();
        ok(_.isEqual(lastRequest[1], model));
      });
      model.set({lastName: 'Hicks'});
    });
  
    test("Model: save", function() {
      doc.save({title : "Henry V"});
      equals(lastRequest[0], 'update');
      ok(_.isEqual(lastRequest[1], doc));
    });
  
    test("Model: fetch", function() {
      doc.fetch();
      ok(lastRequest[0], 'read');
      ok(_.isEqual(lastRequest[1], doc));
    });
  
    test("Model: destroy", function() {
      doc.destroy();
      equals(lastRequest[0], 'delete');
      ok(_.isEqual(lastRequest[1], doc));
    });
  
    test("Model: non-persisted destroy", function() {
      attrs = { 'foo': 1, 'bar': 2, 'baz': 3};
      a = new Backbone.Model(attrs);
      a.sync = function() { throw "should not be called"; };
      ok(a.destroy(), "non-persisted model should not call sync");
    });
  
    test("Model: validate", function() {
      var lastError;
      var model = new Backbone.Model();
      model.validate = function(attrs) {
        if (attrs.admin) return "Can't change admin status.";
      };
      model.bind('error', function(model, error) {
        lastError = error;
      });
      var result = model.set({a: 100});
      equals(result, model);
      equals(model.get('a'), 100);
      equals(lastError, undefined);
      result = model.set({admin: true}, {silent: true});
      equals(lastError, undefined);
      equals(model.get('admin'), true);
      result = model.set({a: 200, admin: true});
      equals(result, false);
      equals(model.get('a'), 100);
      equals(lastError, "Can't change admin status.");
    });
  
    test("Model: validate on unset and clear", function() {
      var error;
      var model = new Backbone.Model({name: "One"});
      model.validate = function(attrs) {
        if ("name" in attrs) {
          if (!attrs.name) {
            error = true;
            return "No thanks.";
          }
        }
      };
      model.set({name: "Two"});
      equals(model.get('name'), 'Two');
      equals(error, undefined);
      model.unset('name');
      equals(error, true);
      equals(model.get('name'), 'Two');
      model.clear();
      equals(model.get('name'), 'Two');
      delete model.validate;
      model.clear();
      equals(model.get('name'), undefined);
    });
  
    test("Model: validate with error callback", function() {
      var lastError, boundError;
      var model = new Backbone.Model();
      model.validate = function(attrs) {
        if (attrs.admin) return "Can't change admin status.";
      };
      var callback = function(model, error) {
        lastError = error;
      };
      model.bind('error', function(model, error) {
        boundError = true;
      });
      var result = model.set({a: 100}, {error: callback});
      equals(result, model);
      equals(model.get('a'), 100);
      equals(lastError, undefined);
      equals(boundError, undefined);
      result = model.set({a: 200, admin: true}, {error: callback});
      equals(result, false);
      equals(model.get('a'), 100);
      equals(lastError, "Can't change admin status.");
      equals(boundError, undefined);
    });
  
    test("Model: Inherit class properties", function() {
      var Parent = Backbone.Model.extend({
        instancePropSame: function() {},
        instancePropDiff: function() {}
      }, {
        classProp: function() {}
      });
      var Child = Parent.extend({
        instancePropDiff: function() {}
      });
  
      var adult = new Parent;
      var kid   = new Child;
  
      equals(Child.classProp, Parent.classProp);
      notEqual(Child.classProp, undefined);
  
      equals(kid.instancePropSame, adult.instancePropSame);
      notEqual(kid.instancePropSame, undefined);
  
      notEqual(Child.prototype.instancePropDiff, Parent.prototype.instancePropDiff);
      notEqual(Child.prototype.instancePropDiff, undefined);
    });
  
    test("Model: Nested change events don't clobber previous attributes", function() {
      var A = Backbone.Model.extend({
        initialize: function() {
          this.bind("change:state", function(a, newState) {
            equals(a.previous('state'), undefined);
            equals(newState, 'hello');
            // Fire a nested change event.
            this.set({ other: "whatever" });
          });
        }
      });
  
      var B = Backbone.Model.extend({
        initialize: function() {
          this.get("a").bind("change:state", function(a, newState) {
            equals(a.previous('state'), undefined);
            equals(newState, 'hello');
          });
        }
      });
  
      a = new A();
      b = new B({a: a});
      a.set({state: 'hello'});
    });
  
  });
  