Make sure that sequelize.authenticate() passes the real error instead of squashing it

lib/sequelize.js

@@ -405,7 +405,7 @@ module.exports = (function() {
         .query('SELECT 1+1 AS result', null, { raw: true, plain: true })
         .complete(function(err, result) {
           if (!!err) {
-            emitter.emit('error', new Error('Invalid credentials.'))
+            emitter.emit('error', new Error(err))
           } else {
             emitter.emit('success')
           }

test/sequelize.test.js

@@ -59,9 +59,37 @@ describe(Support.getTestDialectTeaser("Sequelize"), function () {
         })
       })
 
+      describe('with an invalid connection', function() {
+        beforeEach(function() {
+          var options = _.extend({}, this.sequelize.options, { port: "99999" })
+          this.sequelizeWithInvalidConnection = new Sequelize("wat", "trololo", "wow", options)
+        })
+
+        it('triggers the error event', function(done) {
+          this
+            .sequelizeWithInvalidConnection
+            .authenticate()
+            .complete(function(err, result) {
+              expect(err).to.not.be.null
+              done()
+            })
+        })
+
+        it('triggers the actual adapter error', function(done) {
+          this
+            .sequelizeWithInvalidConnection
+            .authenticate()
+            .complete(function(err, result) {
+              expect(err.message).to.match(/Failed to authenticate/)
+
+              done()
+            })
+        })
+      })
+
       describe('with invalid credentials', function() {
         beforeEach(function() {
-          this.sequelizeWithInvalidCredentials = new Sequelize("omg", "wtf", "lol", this.sequelize.options)
+          this.sequelizeWithInvalidCredentials = new Sequelize("localhost", "wtf", "lol", this.sequelize.options)
         })
 
         it('triggers the error event', function(done) {