fixes jashkenas#928 - Save sends correct attrs.

* Temporarily set model's attrs for `sync`.
* Remove cross-module (global) dependencies in
  Collection, Model, and sync test modules.

backbone.js

@@ -289,7 +289,7 @@
     // If the server returns an attributes hash that differs, the model's
     // state will be `set` again.
     save: function(key, value, options) {
-      var attrs;
+      var attrs, current;
       if (_.isObject(key) || key == null) {
         attrs = key;
         options = value;
@@ -299,7 +299,11 @@
       }
 
       options = options ? _.clone(options) : {};
-      if (attrs && !this[options.wait ? '_validate' : 'set'](attrs, options)) return false;
+      if (options.wait) current = _.clone(this.attributes);
+      var silentOptions = _.extend({}, options, {silent: true});
+      if (attrs && !this.set(attrs, options.wait ? silentOptions : options)) {
+        return false;
+      }
       var model = this;
       var success = options.success;
       options.success = function(resp, status, xhr) {
@@ -314,7 +318,9 @@
       };
       options.error = Backbone.wrapError(options.error, model, options);
       var method = this.isNew() ? 'create' : 'update';
-      return (this.sync || Backbone.sync).call(this, method, this, options);
+      var xhr = (this.sync || Backbone.sync).call(this, method, this, options);
+      if (options.wait) this.set(current, silentOptions);
+      return xhr;
     },
 
     // Destroy this model on the server if it was already persisted.

test/collection.js

@@ -1,12 +1,21 @@
 $(document).ready(function() {
 
-  module("Backbone.Collection");
+  var lastRequest = null;
+  var sync = Backbone.sync;
 
-  window.lastRequest = null;
+  module("Backbone.Collection", {
 
-  Backbone.sync = function() {
-    lastRequest = _.toArray(arguments);
-  };
+    setup: function() {
+      Backbone.sync = function() {
+        lastRequest = _.toArray(arguments);
+      };
+    },
+
+    teardown: function() {
+      Backbone.sync = sync;
+    }
+
+  });
 
   var a         = new Backbone.Model({id: 3, label: 'a'});
   var b         = new Backbone.Model({id: 2, label: 'b'});

test/model.js

@@ -1,16 +1,32 @@
 $(document).ready(function() {
 
-  module("Backbone.Model");
-
   // Variable to catch the last request.
-  window.lastRequest = null;
-
-  window.originalSync = Backbone.sync;
+  var lastRequest = null;
+  // Variable to catch ajax params.
+  var ajaxParams = null;
+  var sync = Backbone.sync;
+  var ajax = $.ajax;
+  var urlRoot = null;
+
+  module("Backbone.Model", {
+
+    setup: function() {
+      Backbone.sync = function() {
+        lastRequest = _.toArray(arguments);
+        sync.apply(this, arguments);
+      };
+      $.ajax = function(params) { ajaxParams = params; };
+      urlRoot = Backbone.Model.prototype.urlRoot;
+      Backbone.Model.prototype.urlRoot = '/';
+    },
+
+    teardown: function() {
+      Backbone.sync = sync;
+      $.ajax = ajax;
+      Backbone.Model.prototype.urlRoot = urlRoot;
+    }
 
-  // Stub out Backbone.request...
-  Backbone.sync = function() {
-    lastRequest = _.toArray(arguments);
-  };
+  });
 
   var attrs = {
     id     : '1-the-tempest',
@@ -67,13 +83,8 @@ $(document).ready(function() {
     doc.collection.url = '/collection/';
     equal(doc.url(), '/collection/1-the-tempest');
     doc.collection = null;
-    var failed = false;
-    try {
-      doc.url();
-    } catch (e) {
-      failed = true;
-    }
-    equal(failed, true);
+    doc.urlRoot = null;
+    raises(function() { doc.url(); });
     doc.collection = collection;
   });
 
@@ -603,4 +614,17 @@ $(document).ready(function() {
     equal(model.previous(''), true);
   });
 
+  test("`save` with `wait` sends correct attributes", function() {
+    var changed = 0;
+    var model = new Backbone.Model({x: 1, y: 2});
+    model.on('change:x', function() { changed++; });
+    model.save({x: 3}, {wait: true});
+    deepEqual(JSON.parse(ajaxParams.data), {x: 3, y: 2});
+    equal(model.get('x'), 1);
+    equal(changed, 0);
+    lastRequest[2].success({});
+    equal(model.get('x'), 3);
+    equal(changed, 1);
+  });
+
 });

test/sync.js

@@ -1,11 +1,21 @@
 $(document).ready(function() {
 
-  module("Backbone.sync", {setup : function() {
-    window.lastRequest = null;
-    $.ajax = function(obj) {
-      lastRequest = obj;
-    };
-  }});
+  var ajax = $.ajax
+  var lastRequest = null;
+
+  module("Backbone.sync", {
+
+    setup : function() {
+      $.ajax = function(obj) {
+        lastRequest = obj;
+      };
+    },
+
+    teardown: function() {
+      $.ajax = ajax;
+    }
+
+  });
 
   var Library = Backbone.Collection.extend({
     url : function() { return '/library'; }
@@ -20,7 +30,6 @@ $(document).ready(function() {
   };
 
   test("sync: read", function() {
-    Backbone.sync = originalSync;
     library.fetch();
     equal(lastRequest.url, '/library');
     equal(lastRequest.type, 'GET');