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(function(QUnit) {
  var Library = Backbone.Collection.extend({    url: function() { return '/library'; }  });  var library;
  var attrs = {    title: 'The Tempest',    author: 'Bill Shakespeare',    length: 123  };
  QUnit.module('Backbone.sync', {
    beforeEach: function(assert) {      library = new Library;      library.create(attrs, {wait: false});    },
    afterEach: function(assert) {      Backbone.emulateHTTP = false;    }
  });
  QUnit.test('read', function(assert) {    assert.expect(4);    library.fetch();    assert.equal(this.ajaxSettings.url, '/library');    assert.equal(this.ajaxSettings.type, 'GET');    assert.equal(this.ajaxSettings.dataType, 'json');    assert.ok(_.isEmpty(this.ajaxSettings.data));  });
  QUnit.test('passing data', function(assert) {    assert.expect(3);    library.fetch({data: {a: 'a', one: 1}});    assert.equal(this.ajaxSettings.url, '/library');    assert.equal(this.ajaxSettings.data.a, 'a');    assert.equal(this.ajaxSettings.data.one, 1);  });
  QUnit.test('create', function(assert) {    assert.expect(6);    assert.equal(this.ajaxSettings.url, '/library');    assert.equal(this.ajaxSettings.type, 'POST');    assert.equal(this.ajaxSettings.dataType, 'json');    var data = JSON.parse(this.ajaxSettings.data);    assert.equal(data.title, 'The Tempest');    assert.equal(data.author, 'Bill Shakespeare');    assert.equal(data.length, 123);  });
  QUnit.test('update', function(assert) {    assert.expect(7);    library.first().save({id: '1-the-tempest', author: 'William Shakespeare'});    assert.equal(this.ajaxSettings.url, '/library/1-the-tempest');    assert.equal(this.ajaxSettings.type, 'PUT');    assert.equal(this.ajaxSettings.dataType, 'json');    var data = JSON.parse(this.ajaxSettings.data);    assert.equal(data.id, '1-the-tempest');    assert.equal(data.title, 'The Tempest');    assert.equal(data.author, 'William Shakespeare');    assert.equal(data.length, 123);  });
  QUnit.test('update with emulateHTTP and emulateJSON', function(assert) {    assert.expect(7);    library.first().save({id: '2-the-tempest', author: 'Tim Shakespeare'}, {      emulateHTTP: true,      emulateJSON: true    });    assert.equal(this.ajaxSettings.url, '/library/2-the-tempest');    assert.equal(this.ajaxSettings.type, 'POST');    assert.equal(this.ajaxSettings.dataType, 'json');    assert.equal(this.ajaxSettings.data._method, 'PUT');    var data = JSON.parse(this.ajaxSettings.data.model);    assert.equal(data.id, '2-the-tempest');    assert.equal(data.author, 'Tim Shakespeare');    assert.equal(data.length, 123);  });
  QUnit.test('update with just emulateHTTP', function(assert) {    assert.expect(6);    library.first().save({id: '2-the-tempest', author: 'Tim Shakespeare'}, {      emulateHTTP: true    });    assert.equal(this.ajaxSettings.url, '/library/2-the-tempest');    assert.equal(this.ajaxSettings.type, 'POST');    assert.equal(this.ajaxSettings.contentType, 'application/json');    var data = JSON.parse(this.ajaxSettings.data);    assert.equal(data.id, '2-the-tempest');    assert.equal(data.author, 'Tim Shakespeare');    assert.equal(data.length, 123);  });
  QUnit.test('update with just emulateJSON', function(assert) {    assert.expect(6);    library.first().save({id: '2-the-tempest', author: 'Tim Shakespeare'}, {      emulateJSON: true    });    assert.equal(this.ajaxSettings.url, '/library/2-the-tempest');    assert.equal(this.ajaxSettings.type, 'PUT');    assert.equal(this.ajaxSettings.contentType, 'application/x-www-form-urlencoded');    var data = JSON.parse(this.ajaxSettings.data.model);    assert.equal(data.id, '2-the-tempest');    assert.equal(data.author, 'Tim Shakespeare');    assert.equal(data.length, 123);  });
  QUnit.test('read model', function(assert) {    assert.expect(3);    library.first().save({id: '2-the-tempest', author: 'Tim Shakespeare'});    library.first().fetch();    assert.equal(this.ajaxSettings.url, '/library/2-the-tempest');    assert.equal(this.ajaxSettings.type, 'GET');    assert.ok(_.isEmpty(this.ajaxSettings.data));  });
  QUnit.test('destroy', function(assert) {    assert.expect(3);    library.first().save({id: '2-the-tempest', author: 'Tim Shakespeare'});    library.first().destroy({wait: true});    assert.equal(this.ajaxSettings.url, '/library/2-the-tempest');    assert.equal(this.ajaxSettings.type, 'DELETE');    assert.equal(this.ajaxSettings.data, null);  });
  QUnit.test('destroy with emulateHTTP', function(assert) {    assert.expect(3);    library.first().save({id: '2-the-tempest', author: 'Tim Shakespeare'});    library.first().destroy({      emulateHTTP: true,      emulateJSON: true    });    assert.equal(this.ajaxSettings.url, '/library/2-the-tempest');    assert.equal(this.ajaxSettings.type, 'POST');    assert.equal(JSON.stringify(this.ajaxSettings.data), '{"_method":"DELETE"}');  });
  QUnit.test('urlError', function(assert) {    assert.expect(2);    var model = new Backbone.Model();    assert.raises(function() {      model.fetch();    });    model.fetch({url: '/one/two'});    assert.equal(this.ajaxSettings.url, '/one/two');  });
  QUnit.test('#1052 - `options` is optional.', function(assert) {    assert.expect(0);    var model = new Backbone.Model();    model.url = '/test';    Backbone.sync('create', model);  });
  QUnit.test('Backbone.ajax', function(assert) {    assert.expect(1);    Backbone.ajax = function(settings) {      assert.strictEqual(settings.url, '/test');    };    var model = new Backbone.Model();    model.url = '/test';    Backbone.sync('create', model);  });
  QUnit.test('Call provided error callback on error.', function(assert) {    assert.expect(1);    var model = new Backbone.Model;    model.url = '/test';    Backbone.sync('read', model, {      error: function() { assert.ok(true); }    });    this.ajaxSettings.error();  });
  QUnit.test('Use Backbone.emulateHTTP as default.', function(assert) {    assert.expect(2);    var model = new Backbone.Model;    model.url = '/test';
    Backbone.emulateHTTP = true;    model.sync('create', model);    assert.strictEqual(this.ajaxSettings.emulateHTTP, true);
    Backbone.emulateHTTP = false;    model.sync('create', model);    assert.strictEqual(this.ajaxSettings.emulateHTTP, false);  });
  QUnit.test('Use Backbone.emulateJSON as default.', function(assert) {    assert.expect(2);    var model = new Backbone.Model;    model.url = '/test';
    Backbone.emulateJSON = true;    model.sync('create', model);    assert.strictEqual(this.ajaxSettings.emulateJSON, true);
    Backbone.emulateJSON = false;    model.sync('create', model);    assert.strictEqual(this.ajaxSettings.emulateJSON, false);  });
  QUnit.test('#1756 - Call user provided beforeSend function.', function(assert) {    assert.expect(4);    Backbone.emulateHTTP = true;    var model = new Backbone.Model;    model.url = '/test';    var xhr = {      setRequestHeader: function(header, value) {        assert.strictEqual(header, 'X-HTTP-Method-Override');        assert.strictEqual(value, 'DELETE');      }    };    model.sync('delete', model, {      beforeSend: function(_xhr) {        assert.ok(_xhr === xhr);        return false;      }    });    assert.strictEqual(this.ajaxSettings.beforeSend(xhr), false);  });
  QUnit.test('#2928 - Pass along `textStatus` and `errorThrown`.', function(assert) {    assert.expect(2);    var model = new Backbone.Model;    model.url = '/test';    model.on('error', function(m, xhr, options) {      assert.strictEqual(options.textStatus, 'textStatus');      assert.strictEqual(options.errorThrown, 'errorThrown');    });    model.fetch();    this.ajaxSettings.error({}, 'textStatus', 'errorThrown');  });
})(QUnit);