check all specs for every single dialect

spec/model.spec.js

 var config    = require("./config/config")
   , Sequelize = require("../index")
-  , sequelize = new Sequelize(config.database, config.username, config.password, { logging: false })
-  , Helpers   = new (require("./config/helpers"))(sequelize)
+  , dialects  = ['sqlite', 'mysql']
 
 describe('Model', function() {
+  dialects.forEach(function(dialect) {
+    describe('with dialect "' + dialect + '"', function() {
       var User      = null
+        , sequelize = new Sequelize(config.database, config.username, config.password, {
+          logging: false,
+          dialect: dialect
+        })
+        , Helpers   = new (require("./config/helpers"))(sequelize)
 
       var setup = function() {
         Helpers.async(function(done) {
@@ -288,6 +294,7 @@ describe('Model', function() {
         it("returns false for objects found by find method", function() {
           Helpers.async(function(done) {
             User.create({ username: 'user' }).success(function(user) {
+              User.create({ username: 'user' }).success(function(user) {
                 User.find(user.id).success(function(user) {
                   expect(user.isNewRecord).toBeFalsy()
                   done()
@@ -295,6 +302,7 @@ describe('Model', function() {
               })
             })
           })
+        })
 
         it("returns false for objects found by findAll method", function() {
           var chainer = new Sequelize.Utils.QueryChainer
@@ -464,4 +472,6 @@ describe('Model', function() {
           })
         })
       })
+    })
+  })
 })