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/test/model.js

https://github.com/huangbaihua001/backbone
JavaScript | 1110 lines | 992 code | 117 blank | 1 comment | 14 complexity | b1079db8f669c096d085e397c361dcdc MD5 | raw file
   1$(document).ready(function() {
   2
   3  var proxy = Backbone.Model.extend();
   4  var klass = Backbone.Collection.extend({
   5    url : function() { return '/collection'; }
   6  });
   7  var doc, collection;
   8
   9  module("Backbone.Model", {
  10
  11    setup: function() {
  12      doc = new proxy({
  13        id     : '1-the-tempest',
  14        title  : "The Tempest",
  15        author : "Bill Shakespeare",
  16        length : 123
  17      });
  18      collection = new klass();
  19      collection.add(doc);
  20    }
  21
  22  });
  23
  24  test("initialize", 3, function() {
  25    var Model = Backbone.Model.extend({
  26      initialize: function() {
  27        this.one = 1;
  28        equal(this.collection, collection);
  29      }
  30    });
  31    var model = new Model({}, {collection: collection});
  32    equal(model.one, 1);
  33    equal(model.collection, collection);
  34  });
  35
  36  test("initialize with attributes and options", 1, function() {
  37    var Model = Backbone.Model.extend({
  38      initialize: function(attributes, options) {
  39        this.one = options.one;
  40      }
  41    });
  42    var model = new Model({}, {one: 1});
  43    equal(model.one, 1);
  44  });
  45
  46  test("initialize with parsed attributes", 1, function() {
  47    var Model = Backbone.Model.extend({
  48      parse: function(attrs) {
  49        attrs.value += 1;
  50        return attrs;
  51      }
  52    });
  53    var model = new Model({value: 1}, {parse: true});
  54    equal(model.get('value'), 2);
  55  });
  56
  57  test("initialize with defaults", 2, function() {
  58    var Model = Backbone.Model.extend({
  59      defaults: {
  60        first_name: 'Unknown',
  61        last_name: 'Unknown'
  62      }
  63    });
  64    var model = new Model({'first_name': 'John'});
  65    equal(model.get('first_name'), 'John');
  66    equal(model.get('last_name'), 'Unknown');
  67  });
  68
  69  test("parse can return null", 1, function() {
  70    var Model = Backbone.Model.extend({
  71      parse: function(attrs) {
  72        attrs.value += 1;
  73        return null;
  74      }
  75    });
  76    var model = new Model({value: 1}, {parse: true});
  77    equal(JSON.stringify(model.toJSON()), "{}");
  78  });
  79
  80  test("url", 3, function() {
  81    doc.urlRoot = null;
  82    equal(doc.url(), '/collection/1-the-tempest');
  83    doc.collection.url = '/collection/';
  84    equal(doc.url(), '/collection/1-the-tempest');
  85    doc.collection = null;
  86    raises(function() { doc.url(); });
  87    doc.collection = collection;
  88  });
  89
  90  test("url when using urlRoot, and uri encoding", 2, function() {
  91    var Model = Backbone.Model.extend({
  92      urlRoot: '/collection'
  93    });
  94    var model = new Model();
  95    equal(model.url(), '/collection');
  96    model.set({id: '+1+'});
  97    equal(model.url(), '/collection/%2B1%2B');
  98  });
  99
 100  test("url when using urlRoot as a function to determine urlRoot at runtime", 2, function() {
 101    var Model = Backbone.Model.extend({
 102      urlRoot: function() {
 103        return '/nested/' + this.get('parent_id') + '/collection';
 104      }
 105    });
 106
 107    var model = new Model({parent_id: 1});
 108    equal(model.url(), '/nested/1/collection');
 109    model.set({id: 2});
 110    equal(model.url(), '/nested/1/collection/2');
 111  });
 112
 113  test("underscore methods", 5, function() {
 114    var model = new Backbone.Model({ 'foo': 'a', 'bar': 'b', 'baz': 'c' });
 115    var model2 = model.clone();
 116    deepEqual(model.keys(), ['foo', 'bar', 'baz']);
 117    deepEqual(model.values(), ['a', 'b', 'c']);
 118    deepEqual(model.invert(), { 'a': 'foo', 'b': 'bar', 'c': 'baz' });
 119    deepEqual(model.pick('foo', 'baz'), {'foo': 'a', 'baz': 'c'});
 120    deepEqual(model.omit('foo', 'bar'), {'baz': 'c'});
 121  });
 122
 123  test("clone", 10, function() {
 124    var a = new Backbone.Model({ 'foo': 1, 'bar': 2, 'baz': 3});
 125    var b = a.clone();
 126    equal(a.get('foo'), 1);
 127    equal(a.get('bar'), 2);
 128    equal(a.get('baz'), 3);
 129    equal(b.get('foo'), a.get('foo'), "Foo should be the same on the clone.");
 130    equal(b.get('bar'), a.get('bar'), "Bar should be the same on the clone.");
 131    equal(b.get('baz'), a.get('baz'), "Baz should be the same on the clone.");
 132    a.set({foo : 100});
 133    equal(a.get('foo'), 100);
 134    equal(b.get('foo'), 1, "Changing a parent attribute does not change the clone.");
 135
 136    var foo = new Backbone.Model({p: 1});
 137    var bar = new Backbone.Model({p: 2});
 138    bar.set(foo.clone().attributes, {unset: true});
 139    equal(foo.get('p'), 1);
 140    equal(bar.get('p'), undefined);
 141  });
 142
 143  test("isNew", 6, function() {
 144    var a = new Backbone.Model({ 'foo': 1, 'bar': 2, 'baz': 3});
 145    ok(a.isNew(), "it should be new");
 146    a = new Backbone.Model({ 'foo': 1, 'bar': 2, 'baz': 3, 'id': -5 });
 147    ok(!a.isNew(), "any defined ID is legal, negative or positive");
 148    a = new Backbone.Model({ 'foo': 1, 'bar': 2, 'baz': 3, 'id': 0 });
 149    ok(!a.isNew(), "any defined ID is legal, including zero");
 150    ok( new Backbone.Model({          }).isNew(), "is true when there is no id");
 151    ok(!new Backbone.Model({ 'id': 2  }).isNew(), "is false for a positive integer");
 152    ok(!new Backbone.Model({ 'id': -5 }).isNew(), "is false for a negative integer");
 153  });
 154
 155  test("get", 2, function() {
 156    equal(doc.get('title'), 'The Tempest');
 157    equal(doc.get('author'), 'Bill Shakespeare');
 158  });
 159
 160  test("escape", 5, function() {
 161    equal(doc.escape('title'), 'The Tempest');
 162    doc.set({audience: 'Bill & Bob'});
 163    equal(doc.escape('audience'), 'Bill & Bob');
 164    doc.set({audience: 'Tim > Joan'});
 165    equal(doc.escape('audience'), 'Tim > Joan');
 166    doc.set({audience: 10101});
 167    equal(doc.escape('audience'), '10101');
 168    doc.unset('audience');
 169    equal(doc.escape('audience'), '');
 170  });
 171
 172  test("has", 10, function() {
 173    var model = new Backbone.Model();
 174
 175    strictEqual(model.has('name'), false);
 176
 177    model.set({
 178      '0': 0,
 179      '1': 1,
 180      'true': true,
 181      'false': false,
 182      'empty': '',
 183      'name': 'name',
 184      'null': null,
 185      'undefined': undefined
 186    });
 187
 188    strictEqual(model.has('0'), true);
 189    strictEqual(model.has('1'), true);
 190    strictEqual(model.has('true'), true);
 191    strictEqual(model.has('false'), true);
 192    strictEqual(model.has('empty'), true);
 193    strictEqual(model.has('name'), true);
 194
 195    model.unset('name');
 196
 197    strictEqual(model.has('name'), false);
 198    strictEqual(model.has('null'), false);
 199    strictEqual(model.has('undefined'), false);
 200  });
 201
 202  test("set and unset", 8, function() {
 203    var a = new Backbone.Model({id: 'id', foo: 1, bar: 2, baz: 3});
 204    var changeCount = 0;
 205    a.on("change:foo", function() { changeCount += 1; });
 206    a.set({'foo': 2});
 207    ok(a.get('foo') == 2, "Foo should have changed.");
 208    ok(changeCount == 1, "Change count should have incremented.");
 209    a.set({'foo': 2}); // set with value that is not new shouldn't fire change event
 210    ok(a.get('foo') == 2, "Foo should NOT have changed, still 2");
 211    ok(changeCount == 1, "Change count should NOT have incremented.");
 212
 213    a.validate = function(attrs) {
 214      equal(attrs.foo, void 0, "validate:true passed while unsetting");
 215    };
 216    a.unset('foo', {validate: true});
 217    equal(a.get('foo'), void 0, "Foo should have changed");
 218    delete a.validate;
 219    ok(changeCount == 2, "Change count should have incremented for unset.");
 220
 221    a.unset('id');
 222    equal(a.id, undefined, "Unsetting the id should remove the id property.");
 223  });
 224
 225  test("#2030 - set with failed validate, followed by another set triggers change", function () {
 226    var attr = 0, main = 0, error = 0;
 227    var Model = Backbone.Model.extend({
 228      validate: function (attr) {
 229        if (attr.x > 1) {
 230          error++;
 231          return "this is an error";
 232        }
 233      }
 234    });
 235    var model = new Model({x:0});
 236      model.on('change:x', function () { attr++; });
 237      model.on('change', function () { main++; });
 238      model.set({x:2}, {validate:true});
 239      model.set({x:1}, {validate:true});
 240      deepEqual([attr, main, error], [1, 1, 1]);
 241  });
 242
 243  test("set triggers changes in the correct order", function() {
 244    var value = null;
 245    var model = new Backbone.Model;
 246    model.on('last', function(){ value = 'last'; });
 247    model.on('first', function(){ value = 'first'; });
 248    model.trigger('first');
 249    model.trigger('last');
 250    equal(value, 'last');
 251  });
 252
 253  test("set falsy values in the correct order", 2, function() {
 254    var model = new Backbone.Model({result: 'result'});
 255    model.on('change', function() {
 256      equal(model.changed.result, void 0);
 257      equal(model.previous('result'), false);
 258    });
 259    model.set({result: void 0}, {silent: true});
 260    model.set({result: null}, {silent: true});
 261    model.set({result: false}, {silent: true});
 262    model.set({result: void 0});
 263  });
 264
 265  test("multiple unsets", 1, function() {
 266    var i = 0;
 267    var counter = function(){ i++; };
 268    var model = new Backbone.Model({a: 1});
 269    model.on("change:a", counter);
 270    model.set({a: 2});
 271    model.unset('a');
 272    model.unset('a');
 273    equal(i, 2, 'Unset does not fire an event for missing attributes.');
 274  });
 275
 276  test("unset and changedAttributes", 1, function() {
 277    var model = new Backbone.Model({a: 1});
 278    model.on('change', function() {
 279      ok('a' in model.changedAttributes(), 'changedAttributes should contain unset properties');
 280    });
 281    model.unset('a');
 282  });
 283
 284  test("using a non-default id attribute.", 5, function() {
 285    var MongoModel = Backbone.Model.extend({idAttribute : '_id'});
 286    var model = new MongoModel({id: 'eye-dee', _id: 25, title: 'Model'});
 287    equal(model.get('id'), 'eye-dee');
 288    equal(model.id, 25);
 289    equal(model.isNew(), false);
 290    model.unset('_id');
 291    equal(model.id, undefined);
 292    equal(model.isNew(), true);
 293  });
 294
 295  test("set an empty string", 1, function() {
 296    var model = new Backbone.Model({name : "Model"});
 297    model.set({name : ''});
 298    equal(model.get('name'), '');
 299  });
 300
 301  test("setting an object", 1, function() {
 302    var model = new Backbone.Model({
 303      custom: { foo: 1 }
 304    });
 305    model.on('change', function() {
 306      ok(1);
 307    });
 308    model.set({
 309      custom: { foo: 1 } // no change should be fired
 310    });
 311    model.set({
 312      custom: { foo: 2 } // change event should be fired
 313    });
 314  });
 315
 316  test("clear", 3, function() {
 317    var changed;
 318    var model = new Backbone.Model({id: 1, name : "Model"});
 319    model.on("change:name", function(){ changed = true; });
 320    model.on("change", function() {
 321      var changedAttrs = model.changedAttributes();
 322      ok('name' in changedAttrs);
 323    });
 324    model.clear();
 325    equal(changed, true);
 326    equal(model.get('name'), undefined);
 327  });
 328
 329  test("defaults", 4, function() {
 330    var Defaulted = Backbone.Model.extend({
 331      defaults: {
 332        "one": 1,
 333        "two": 2
 334      }
 335    });
 336    var model = new Defaulted({two: undefined});
 337    equal(model.get('one'), 1);
 338    equal(model.get('two'), 2);
 339    Defaulted = Backbone.Model.extend({
 340      defaults: function() {
 341        return {
 342          "one": 3,
 343          "two": 4
 344        };
 345      }
 346    });
 347    model = new Defaulted({two: undefined});
 348    equal(model.get('one'), 3);
 349    equal(model.get('two'), 4);
 350  });
 351
 352  test("change, hasChanged, changedAttributes, previous, previousAttributes", 9, function() {
 353    var model = new Backbone.Model({name: "Tim", age: 10});
 354    deepEqual(model.changedAttributes(), false);
 355    model.on('change', function() {
 356      ok(model.hasChanged('name'), 'name changed');
 357      ok(!model.hasChanged('age'), 'age did not');
 358      ok(_.isEqual(model.changedAttributes(), {name : 'Rob'}), 'changedAttributes returns the changed attrs');
 359      equal(model.previous('name'), 'Tim');
 360      ok(_.isEqual(model.previousAttributes(), {name : "Tim", age : 10}), 'previousAttributes is correct');
 361    });
 362    equal(model.hasChanged(), false);
 363    equal(model.hasChanged(undefined), false);
 364    model.set({name : 'Rob'});
 365    equal(model.get('name'), 'Rob');
 366  });
 367
 368  test("changedAttributes", 3, function() {
 369    var model = new Backbone.Model({a: 'a', b: 'b'});
 370    deepEqual(model.changedAttributes(), false);
 371    equal(model.changedAttributes({a: 'a'}), false);
 372    equal(model.changedAttributes({a: 'b'}).a, 'b');
 373  });
 374
 375  test("change with options", 2, function() {
 376    var value;
 377    var model = new Backbone.Model({name: 'Rob'});
 378    model.on('change', function(model, options) {
 379      value = options.prefix + model.get('name');
 380    });
 381    model.set({name: 'Bob'}, {prefix: 'Mr. '});
 382    equal(value, 'Mr. Bob');
 383    model.set({name: 'Sue'}, {prefix: 'Ms. '});
 384    equal(value, 'Ms. Sue');
 385  });
 386
 387  test("change after initialize", 1, function () {
 388    var changed = 0;
 389    var attrs = {id: 1, label: 'c'};
 390    var obj = new Backbone.Model(attrs);
 391    obj.on('change', function() { changed += 1; });
 392    obj.set(attrs);
 393    equal(changed, 0);
 394  });
 395
 396  test("save within change event", 1, function () {
 397    var env = this;
 398    var model = new Backbone.Model({firstName : "Taylor", lastName: "Swift"});
 399    model.url = '/test';
 400    model.on('change', function () {
 401      model.save();
 402      ok(_.isEqual(env.syncArgs.model, model));
 403    });
 404    model.set({lastName: 'Hicks'});
 405  });
 406
 407  test("validate after save", 2, function() {
 408    var lastError, model = new Backbone.Model();
 409    model.validate = function(attrs) {
 410      if (attrs.admin) return "Can't change admin status.";
 411    };
 412    model.sync = function(method, model, options) {
 413      options.success.call(this, {admin: true});
 414    };
 415    model.on('invalid', function(model, error) {
 416      lastError = error;
 417    });
 418    model.save(null);
 419
 420    equal(lastError, "Can't change admin status.");
 421    equal(model.validationError, "Can't change admin status.");
 422  });
 423
 424  test("save", 2, function() {
 425    doc.save({title : "Henry V"});
 426    equal(this.syncArgs.method, 'update');
 427    ok(_.isEqual(this.syncArgs.model, doc));
 428  });
 429
 430  test("save, fetch, destroy triggers error event when an error occurs", 3, function () {
 431    var model = new Backbone.Model();
 432    model.on('error', function () {
 433      ok(true);
 434    });
 435    model.sync = function (method, model, options) {
 436      options.error();
 437    };
 438    model.save({data: 2, id: 1});
 439    model.fetch();
 440    model.destroy();
 441  });
 442
 443  test("save with PATCH", function() {
 444    doc.clear().set({id: 1, a: 1, b: 2, c: 3, d: 4});
 445    doc.save();
 446    equal(this.syncArgs.method, 'update');
 447    equal(this.syncArgs.options.attrs, undefined);
 448
 449    doc.save({b: 2, d: 4}, {patch: true});
 450    equal(this.syncArgs.method, 'patch');
 451    equal(_.size(this.syncArgs.options.attrs), 2);
 452    equal(this.syncArgs.options.attrs.d, 4);
 453    equal(this.syncArgs.options.attrs.a, undefined);
 454    equal(this.ajaxSettings.data, "{\"b\":2,\"d\":4}");
 455  });
 456
 457  test("save in positional style", 1, function() {
 458    var model = new Backbone.Model();
 459    model.sync = function(method, model, options) {
 460      options.success();
 461    };
 462    model.save('title', 'Twelfth Night');
 463    equal(model.get('title'), 'Twelfth Night');
 464  });
 465
 466  test("save with non-object success response", 2, function () {
 467    var model = new Backbone.Model();
 468    model.sync = function(method, model, options) {
 469      options.success('', options);
 470      options.success(null, options);
 471    };
 472    model.save({testing:'empty'}, {
 473      success: function (model) {
 474        deepEqual(model.attributes, {testing:'empty'});
 475      }
 476    });
 477  });
 478
 479  test("fetch", 2, function() {
 480    doc.fetch();
 481    equal(this.syncArgs.method, 'read');
 482    ok(_.isEqual(this.syncArgs.model, doc));
 483  });
 484
 485  test("destroy", 3, function() {
 486    doc.destroy();
 487    equal(this.syncArgs.method, 'delete');
 488    ok(_.isEqual(this.syncArgs.model, doc));
 489
 490    var newModel = new Backbone.Model;
 491    equal(newModel.destroy(), false);
 492  });
 493
 494  test("non-persisted destroy", 1, function() {
 495    var a = new Backbone.Model({ 'foo': 1, 'bar': 2, 'baz': 3});
 496    a.sync = function() { throw "should not be called"; };
 497    a.destroy();
 498    ok(true, "non-persisted model should not call sync");
 499  });
 500
 501  test("validate", function() {
 502    var lastError;
 503    var model = new Backbone.Model();
 504    model.validate = function(attrs) {
 505      if (attrs.admin != this.get('admin')) return "Can't change admin status.";
 506    };
 507    model.on('invalid', function(model, error) {
 508      lastError = error;
 509    });
 510    var result = model.set({a: 100});
 511    equal(result, model);
 512    equal(model.get('a'), 100);
 513    equal(lastError, undefined);
 514    result = model.set({admin: true});
 515    equal(model.get('admin'), true);
 516    result = model.set({a: 200, admin: false}, {validate:true});
 517    equal(lastError, "Can't change admin status.");
 518    equal(result, false);
 519    equal(model.get('a'), 100);
 520  });
 521
 522  test("validate on unset and clear", 6, function() {
 523    var error;
 524    var model = new Backbone.Model({name: "One"});
 525    model.validate = function(attrs) {
 526      if (!attrs.name) {
 527        error = true;
 528        return "No thanks.";
 529      }
 530    };
 531    model.set({name: "Two"});
 532    equal(model.get('name'), 'Two');
 533    equal(error, undefined);
 534    model.unset('name', {validate: true});
 535    equal(error, true);
 536    equal(model.get('name'), 'Two');
 537    model.clear({validate:true});
 538    equal(model.get('name'), 'Two');
 539    delete model.validate;
 540    model.clear();
 541    equal(model.get('name'), undefined);
 542  });
 543
 544  test("validate with error callback", 8, function() {
 545    var lastError, boundError;
 546    var model = new Backbone.Model();
 547    model.validate = function(attrs) {
 548      if (attrs.admin) return "Can't change admin status.";
 549    };
 550    model.on('invalid', function(model, error) {
 551      boundError = true;
 552    });
 553    var result = model.set({a: 100}, {validate:true});
 554    equal(result, model);
 555    equal(model.get('a'), 100);
 556    equal(model.validationError, null);
 557    equal(boundError, undefined);
 558    result = model.set({a: 200, admin: true}, {validate:true});
 559    equal(result, false);
 560    equal(model.get('a'), 100);
 561    equal(model.validationError, "Can't change admin status.");
 562    equal(boundError, true);
 563  });
 564
 565  test("defaults always extend attrs (#459)", 2, function() {
 566    var Defaulted = Backbone.Model.extend({
 567      defaults: {one: 1},
 568      initialize : function(attrs, opts) {
 569        equal(this.attributes.one, 1);
 570      }
 571    });
 572    var providedattrs = new Defaulted({});
 573    var emptyattrs = new Defaulted();
 574  });
 575
 576  test("Inherit class properties", 6, function() {
 577    var Parent = Backbone.Model.extend({
 578      instancePropSame: function() {},
 579      instancePropDiff: function() {}
 580    }, {
 581      classProp: function() {}
 582    });
 583    var Child = Parent.extend({
 584      instancePropDiff: function() {}
 585    });
 586
 587    var adult = new Parent;
 588    var kid   = new Child;
 589
 590    equal(Child.classProp, Parent.classProp);
 591    notEqual(Child.classProp, undefined);
 592
 593    equal(kid.instancePropSame, adult.instancePropSame);
 594    notEqual(kid.instancePropSame, undefined);
 595
 596    notEqual(Child.prototype.instancePropDiff, Parent.prototype.instancePropDiff);
 597    notEqual(Child.prototype.instancePropDiff, undefined);
 598  });
 599
 600  test("Nested change events don't clobber previous attributes", 4, function() {
 601    new Backbone.Model()
 602    .on('change:state', function(model, newState) {
 603      equal(model.previous('state'), undefined);
 604      equal(newState, 'hello');
 605      // Fire a nested change event.
 606      model.set({other: 'whatever'});
 607    })
 608    .on('change:state', function(model, newState) {
 609      equal(model.previous('state'), undefined);
 610      equal(newState, 'hello');
 611    })
 612    .set({state: 'hello'});
 613  });
 614
 615  test("hasChanged/set should use same comparison", 2, function() {
 616    var changed = 0, model = new Backbone.Model({a: null});
 617    model.on('change', function() {
 618      ok(this.hasChanged('a'));
 619    })
 620    .on('change:a', function() {
 621      changed++;
 622    })
 623    .set({a: undefined});
 624    equal(changed, 1);
 625  });
 626
 627  test("#582, #425, change:attribute callbacks should fire after all changes have occurred", 9, function() {
 628    var model = new Backbone.Model;
 629
 630    var assertion = function() {
 631      equal(model.get('a'), 'a');
 632      equal(model.get('b'), 'b');
 633      equal(model.get('c'), 'c');
 634    };
 635
 636    model.on('change:a', assertion);
 637    model.on('change:b', assertion);
 638    model.on('change:c', assertion);
 639
 640    model.set({a: 'a', b: 'b', c: 'c'});
 641  });
 642
 643  test("#871, set with attributes property", 1, function() {
 644    var model = new Backbone.Model();
 645    model.set({attributes: true});
 646    ok(model.has('attributes'));
 647  });
 648
 649  test("set value regardless of equality/change", 1, function() {
 650    var model = new Backbone.Model({x: []});
 651    var a = [];
 652    model.set({x: a});
 653    ok(model.get('x') === a);
 654  });
 655
 656  test("set same value does not trigger change", 0, function() {
 657    var model = new Backbone.Model({x: 1});
 658    model.on('change change:x', function() { ok(false); });
 659    model.set({x: 1});
 660    model.set({x: 1});
 661  });
 662
 663  test("unset does not fire a change for undefined attributes", 0, function() {
 664    var model = new Backbone.Model({x: undefined});
 665    model.on('change:x', function(){ ok(false); });
 666    model.unset('x');
 667  });
 668
 669  test("set: undefined values", 1, function() {
 670    var model = new Backbone.Model({x: undefined});
 671    ok('x' in model.attributes);
 672  });
 673
 674  test("hasChanged works outside of change events, and true within", 6, function() {
 675    var model = new Backbone.Model({x: 1});
 676    model.on('change:x', function() {
 677      ok(model.hasChanged('x'));
 678      equal(model.get('x'), 1);
 679    });
 680    model.set({x: 2}, {silent: true});
 681    ok(model.hasChanged());
 682    equal(model.hasChanged('x'), true);
 683    model.set({x: 1});
 684    ok(model.hasChanged());
 685    equal(model.hasChanged('x'), true);
 686  });
 687
 688  test("hasChanged gets cleared on the following set", 4, function() {
 689    var model = new Backbone.Model;
 690    model.set({x: 1});
 691    ok(model.hasChanged());
 692    model.set({x: 1});
 693    ok(!model.hasChanged());
 694    model.set({x: 2});
 695    ok(model.hasChanged());
 696    model.set({});
 697    ok(!model.hasChanged());
 698  });
 699
 700  test("save with `wait` succeeds without `validate`", 1, function() {
 701    var model = new Backbone.Model();
 702    model.url = '/test';
 703    model.save({x: 1}, {wait: true});
 704    ok(this.syncArgs.model === model);
 705  });
 706
 707  test("save without `wait` doesn't set invalid attributes", function () {
 708    var model = new Backbone.Model();
 709    model.validate = function () { return 1; }
 710    model.save({a: 1});
 711    equal(model.get('a'), void 0);
 712  });
 713
 714  test("save doesn't validate twice", function () {
 715    var model = new Backbone.Model();
 716    var times = 0;
 717    model.sync = function () {};
 718    model.validate = function () { ++times; }
 719    model.save({});
 720    equal(times, 1);
 721  });
 722
 723  test("`hasChanged` for falsey keys", 2, function() {
 724    var model = new Backbone.Model();
 725    model.set({x: true}, {silent: true});
 726    ok(!model.hasChanged(0));
 727    ok(!model.hasChanged(''));
 728  });
 729
 730  test("`previous` for falsey keys", 2, function() {
 731    var model = new Backbone.Model({0: true, '': true});
 732    model.set({0: false, '': false}, {silent: true});
 733    equal(model.previous(0), true);
 734    equal(model.previous(''), true);
 735  });
 736
 737  test("`save` with `wait` sends correct attributes", 5, function() {
 738    var changed = 0;
 739    var model = new Backbone.Model({x: 1, y: 2});
 740    model.url = '/test';
 741    model.on('change:x', function() { changed++; });
 742    model.save({x: 3}, {wait: true});
 743    deepEqual(JSON.parse(this.ajaxSettings.data), {x: 3, y: 2});
 744    equal(model.get('x'), 1);
 745    equal(changed, 0);
 746    this.syncArgs.options.success({});
 747    equal(model.get('x'), 3);
 748    equal(changed, 1);
 749  });
 750
 751  test("a failed `save` with `wait` doesn't leave attributes behind", 1, function() {
 752    var model = new Backbone.Model;
 753    model.url = '/test';
 754    model.save({x: 1}, {wait: true});
 755    equal(model.get('x'), void 0);
 756  });
 757
 758  test("#1030 - `save` with `wait` results in correct attributes if success is called during sync", 2, function() {
 759    var model = new Backbone.Model({x: 1, y: 2});
 760    model.sync = function(method, model, options) {
 761      options.success();
 762    };
 763    model.on("change:x", function() { ok(true); });
 764    model.save({x: 3}, {wait: true});
 765    equal(model.get('x'), 3);
 766  });
 767
 768  test("save with wait validates attributes", function() {
 769    var model = new Backbone.Model();
 770    model.url = '/test';
 771    model.validate = function() { ok(true); };
 772    model.save({x: 1}, {wait: true});
 773  });
 774
 775  test("save turns on parse flag", function () {
 776    var Model = Backbone.Model.extend({
 777      sync: function(method, model, options) { ok(options.parse); }
 778    });
 779    new Model().save();
 780  });
 781
 782  test("nested `set` during `'change:attr'`", 2, function() {
 783    var events = [];
 784    var model = new Backbone.Model();
 785    model.on('all', function(event) { events.push(event); });
 786    model.on('change', function() {
 787      model.set({z: true}, {silent:true});
 788    });
 789    model.on('change:x', function() {
 790      model.set({y: true});
 791    });
 792    model.set({x: true});
 793    deepEqual(events, ['change:y', 'change:x', 'change']);
 794    events = [];
 795    model.set({z: true});
 796    deepEqual(events, []);
 797  });
 798
 799  test("nested `change` only fires once", 1, function() {
 800    var model = new Backbone.Model();
 801    model.on('change', function() {
 802      ok(true);
 803      model.set({x: true});
 804    });
 805    model.set({x: true});
 806  });
 807
 808  test("nested `set` during `'change'`", 6, function() {
 809    var count = 0;
 810    var model = new Backbone.Model();
 811    model.on('change', function() {
 812      switch(count++) {
 813        case 0:
 814          deepEqual(this.changedAttributes(), {x: true});
 815          equal(model.previous('x'), undefined);
 816          model.set({y: true});
 817          break;
 818        case 1:
 819          deepEqual(this.changedAttributes(), {x: true, y: true});
 820          equal(model.previous('x'), undefined);
 821          model.set({z: true});
 822          break;
 823        case 2:
 824          deepEqual(this.changedAttributes(), {x: true, y: true, z: true});
 825          equal(model.previous('y'), undefined);
 826          break;
 827        default:
 828          ok(false);
 829      }
 830    });
 831    model.set({x: true});
 832  });
 833
 834  test("nested `change` with silent", 3, function() {
 835    var count = 0;
 836    var model = new Backbone.Model();
 837    model.on('change:y', function() { ok(false); });
 838    model.on('change', function() {
 839      switch(count++) {
 840        case 0:
 841          deepEqual(this.changedAttributes(), {x: true});
 842          model.set({y: true}, {silent: true});
 843          model.set({z: true});
 844          break;
 845        case 1:
 846          deepEqual(this.changedAttributes(), {x: true, y: true, z: true});
 847          break;
 848        case 2:
 849          deepEqual(this.changedAttributes(), {z: false});
 850          break;
 851        default:
 852          ok(false);
 853      }
 854    });
 855    model.set({x: true});
 856    model.set({z: false});
 857  });
 858
 859  test("nested `change:attr` with silent", 0, function() {
 860    var model = new Backbone.Model();
 861    model.on('change:y', function(){ ok(false); });
 862    model.on('change', function() {
 863      model.set({y: true}, {silent: true});
 864      model.set({z: true});
 865    });
 866    model.set({x: true});
 867  });
 868
 869  test("multiple nested changes with silent", 1, function() {
 870    var model = new Backbone.Model();
 871    model.on('change:x', function() {
 872      model.set({y: 1}, {silent: true});
 873      model.set({y: 2});
 874    });
 875    model.on('change:y', function(model, val) {
 876      equal(val, 2);
 877    });
 878    model.set({x: true});
 879  });
 880
 881  test("multiple nested changes with silent", 1, function() {
 882    var changes = [];
 883    var model = new Backbone.Model();
 884    model.on('change:b', function(model, val) { changes.push(val); });
 885    model.on('change', function() {
 886      model.set({b: 1});
 887    });
 888    model.set({b: 0});
 889    deepEqual(changes, [0, 1]);
 890  });
 891
 892  test("basic silent change semantics", 1, function() {
 893    var model = new Backbone.Model;
 894    model.set({x: 1});
 895    model.on('change', function(){ ok(true); });
 896    model.set({x: 2}, {silent: true});
 897    model.set({x: 1});
 898  });
 899
 900  test("nested set multiple times", 1, function() {
 901    var model = new Backbone.Model();
 902    model.on('change:b', function() {
 903      ok(true);
 904    });
 905    model.on('change:a', function() {
 906      model.set({b: true});
 907      model.set({b: true});
 908    });
 909    model.set({a: true});
 910  });
 911
 912  test("#1122 - clear does not alter options.", 1, function() {
 913    var model = new Backbone.Model();
 914    var options = {};
 915    model.clear(options);
 916    ok(!options.unset);
 917  });
 918
 919  test("#1122 - unset does not alter options.", 1, function() {
 920    var model = new Backbone.Model();
 921    var options = {};
 922    model.unset('x', options);
 923    ok(!options.unset);
 924  });
 925
 926  test("#1355 - `options` is passed to success callbacks", 3, function() {
 927    var model = new Backbone.Model();
 928    var opts = {
 929      success: function( model, resp, options ) {
 930        ok(options);
 931      }
 932    };
 933    model.sync = function(method, model, options) {
 934      options.success();
 935    };
 936    model.save({id: 1}, opts);
 937    model.fetch(opts);
 938    model.destroy(opts);
 939  });
 940
 941  test("#1412 - Trigger 'sync' event.", 3, function() {
 942    var model = new Backbone.Model({id: 1});
 943    model.sync = function (method, model, options) { options.success(); };
 944    model.on('sync', function(){ ok(true); });
 945    model.fetch();
 946    model.save();
 947    model.destroy();
 948  });
 949
 950  test("#1365 - Destroy: New models execute success callback.", 2, function() {
 951    new Backbone.Model()
 952    .on('sync', function() { ok(false); })
 953    .on('destroy', function(){ ok(true); })
 954    .destroy({ success: function(){ ok(true); }});
 955  });
 956
 957  test("#1433 - Save: An invalid model cannot be persisted.", 1, function() {
 958    var model = new Backbone.Model;
 959    model.validate = function(){ return 'invalid'; };
 960    model.sync = function(){ ok(false); };
 961    strictEqual(model.save(), false);
 962  });
 963
 964  test("#1377 - Save without attrs triggers 'error'.", 1, function() {
 965    var Model = Backbone.Model.extend({
 966      url: '/test/',
 967      sync: function(method, model, options){ options.success(); },
 968      validate: function(){ return 'invalid'; }
 969    });
 970    var model = new Model({id: 1});
 971    model.on('invalid', function(){ ok(true); });
 972    model.save();
 973  });
 974
 975  test("#1545 - `undefined` can be passed to a model constructor without coersion", function() {
 976    var Model = Backbone.Model.extend({
 977      defaults: { one: 1 },
 978      initialize : function(attrs, opts) {
 979        equal(attrs, undefined);
 980      }
 981    });
 982    var emptyattrs = new Model();
 983    var undefinedattrs = new Model(undefined);
 984  });
 985
 986  asyncTest("#1478 - Model `save` does not trigger change on unchanged attributes", 0, function() {
 987    var Model = Backbone.Model.extend({
 988      sync: function(method, model, options) {
 989        setTimeout(function(){
 990          options.success();
 991          start();
 992        }, 0);
 993      }
 994    });
 995    new Model({x: true})
 996    .on('change:x', function(){ ok(false); })
 997    .save(null, {wait: true});
 998  });
 999
1000  test("#1664 - Changing from one value, silently to another, back to original triggers a change.", 1, function() {
1001    var model = new Backbone.Model({x:1});
1002    model.on('change:x', function() { ok(true); });
1003    model.set({x:2},{silent:true});
1004    model.set({x:3},{silent:true});
1005    model.set({x:1});
1006  });
1007
1008  test("#1664 - multiple silent changes nested inside a change event", 2, function() {
1009    var changes = [];
1010    var model = new Backbone.Model();
1011    model.on('change', function() {
1012      model.set({a:'c'}, {silent:true});
1013      model.set({b:2}, {silent:true});
1014      model.unset('c', {silent:true});
1015    });
1016    model.on('change:a change:b change:c', function(model, val) { changes.push(val); });
1017    model.set({a:'a', b:1, c:'item'});
1018    deepEqual(changes, ['a',1,'item']);
1019    deepEqual(model.attributes, {a: 'c', b: 2});
1020  });
1021
1022  test("#1791 - `attributes` is available for `parse`", function() {
1023    var Model = Backbone.Model.extend({
1024      parse: function() { this.has('a'); } // shouldn't throw an error
1025    });
1026    var model = new Model(null, {parse: true});
1027    expect(0);
1028  });
1029
1030  test("silent changes in last `change` event back to original triggers change", 2, function() {
1031    var changes = [];
1032    var model = new Backbone.Model();
1033    model.on('change:a change:b change:c', function(model, val) { changes.push(val); });
1034    model.on('change', function() {
1035      model.set({a:'c'}, {silent:true});
1036    });
1037    model.set({a:'a'});
1038    deepEqual(changes, ['a']);
1039    model.set({a:'a'});
1040    deepEqual(changes, ['a', 'a']);
1041  });
1042
1043  test("#1943 change calculations should use _.isEqual", function() {
1044    var model = new Backbone.Model({a: {key: 'value'}});
1045    model.set('a', {key:'value'}, {silent:true});
1046    equal(model.changedAttributes(), false);
1047  });
1048
1049  test("#1964 - final `change` event is always fired, regardless of interim changes", 1, function () {
1050    var model = new Backbone.Model();
1051    model.on('change:property', function() {
1052      model.set('property', 'bar');
1053    });
1054    model.on('change', function() {
1055      ok(true);
1056    });
1057    model.set('property', 'foo');
1058  });
1059
1060  test("isValid", function() {
1061    var model = new Backbone.Model({valid: true});
1062    model.validate = function(attrs) {
1063      if (!attrs.valid) return "invalid";
1064    };
1065    equal(model.isValid(), true);
1066    equal(model.set({valid: false}, {validate:true}), false);
1067    equal(model.isValid(), true);
1068    model.set({valid:false});
1069    equal(model.isValid(), false);
1070    ok(!model.set('valid', false, {validate: true}));
1071  });
1072
1073  test("#1179 - isValid returns true in the absence of validate.", 1, function() {
1074    var model = new Backbone.Model();
1075    model.validate = null;
1076    ok(model.isValid());
1077  });
1078
1079  test("#1961 - Creating a model with {validate:true} will call validate and use the error callback", function () {
1080    var Model = Backbone.Model.extend({
1081      validate: function (attrs) {
1082        if (attrs.id === 1) return "This shouldn't happen";
1083      }
1084    });
1085    var model = new Model({id: 1}, {validate: true});
1086    equal(model.validationError, "This shouldn't happen");
1087  });
1088
1089  test("toJSON receives attrs during save(..., {wait: true})", 1, function() {
1090    var Model = Backbone.Model.extend({
1091      url: '/test',
1092      toJSON: function() {
1093        strictEqual(this.attributes.x, 1);
1094        return _.clone(this.attributes);
1095      }
1096    });
1097    var model = new Model;
1098    model.save({x: 1}, {wait: true});
1099  });
1100
1101  test("#2034 - nested set with silent only triggers one change", 1, function() {
1102    var model = new Backbone.Model();
1103    model.on('change', function() {
1104      model.set({b: true}, {silent: true});
1105      ok(true);
1106    });
1107    model.set({a: true});
1108  });
1109
1110});