the uber test for parallel transactions

test/sequelize.test.js

@@ -523,6 +523,55 @@ describe(Support.getTestDialectTeaser("Sequelize"), function () {
           })
         })
       })
+
+      it("correctly handles multiple transactions", function(done) {
+        var TransactionTest = this.sequelize.define('TransactionTest', { name: DataTypes.STRING })
+          , self            = this
+          , count           = function(transaction, callback) {
+                                self
+                                  .sequelize
+                                  .query('SELECT count(*) as cnt FROM `TransactionTests`', null, { plain: true, raw: true, transaction: transaction })
+                                  .success(function(result) {
+                                    callback(result.cnt)
+                                  })
+                              }
+
+        TransactionTest.sync({ force: true }).success(function() {
+          self.sequelize.transaction(function(t1) {
+            self.sequelize.query('INSERT INTO `TransactionTests` (`name`) VALUES ("foo");', null, { plain: true, raw: true, transaction: t1 }).success(function() {
+              self.sequelize.transaction(function(t2) {
+                self.sequelize.query('INSERT INTO `TransactionTests` (`name`) VALUES ("bar");', null, { plain: true, raw: true, transaction: t2 }).success(function() {
+                  count(null, function(cnt) {
+                    expect(cnt).to.equal(0)
+
+                    count(t1, function(cnt) {
+                      expect(cnt).to.equal(1)
+
+                      count(t2, function(cnt) {
+                        expect(cnt).to.equal(1)
+
+                        t2.rollback().success(function() {
+                          count(t2, function(cnt) {
+                            expect(cnt).to.equal(0)
+
+                            t1.commit().success(function() {
+                              count(null, function(cnt) {
+                                expect(cnt).to.equal(1)
+                              })
+                            })
+                          })
+                        })
+                      })
+                    })
+                  })
+                })
+              })
+            })
+          }).done(function() {
+            done()
+          })
+        })
+      })
     })
   })
 })