Roy Osherove Sela Group ISerializable.com (blog)

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ArtOfUnitTesting.com

Agenda  Unit Testing Vs. Integration Testing  To mock or not to mock the DB?  Rolling back DB state Restore, Manual load, COM+, XTUnit, System.Transactions  Working and testing with DataSets  Pure DB tests with DataDude  Short song?

Demos  Rollbacks:  COM+ 1.0  COM+ 1.5 (ServiceConfig)  XtUnit  MbUnit [DataRollback]  MbUnit [SqlDbRestore]  TransactionScope  Comparing DataSets  DataDude  DataSet loader with XML file update and delete  NHibernate ORM  ActiveRecord testing

Why should I care?  Automated testing and regressions  Data Layer also contains logic!  Cost of changes is lowered

What is a Unit-Testable System  For each piece of coded logic in the system, a unit test can be written easily enough to verify it works as expected while keeping the PC-COF rules  Partial runs are possible  Configuration is not needed  Consistent pass/fail result  Order does not matter  Fast

Integration Vs. Unit Test  Takes longer  Needs configuration  Needs large parts or whole system  Like a car engine

(and learn to tell the difference)

UI Logic Data Layer DB

Why NOT mock it?  You don’t test the DB logic itself  Keys  Indexes  Integrity Rules  Security  Triggers  Etc… DB

Unit testing against MySimpleClass

Rolling back DB Data  XML File (semi manual loading)  DB Restore  Transaction COM+ COM+ 1.5 System.Transactions  XtUnit  MbUnit

Demo

Resetting an identity column USE pubs GO Delete from mytable GO DBCC CHECKIDENT ('mytable', RESEED, 0) DBCC CHECKIDENT ('mytable', RESEED) GO

Allowing IDENTITY INSERT set IDENTITY_INSERT mytable on..insert set IDENTITY_INSERT mytable off

XML Loading Hard to maintain :  when there is parent-child relationships  When schema changes

Rolling back using COM+  Test Driven Development with Microsoft.NET  (James Newkirk)  COM+ == System.EnterpriseServices  Distributed Transactions  MyObject:ServicedComponent

Serviced Tests MyTestClass:ServicedComponent Transaction MySimpleClass

Serviced Tests On Code with ADO.NET Transactions MyTestClass:ServicedComponent Transaction MySimpleClass Transaction 2 SomeOtherClass

Problems with COM+ Rollback  What if you are calling other serviced Components?  What if they require a new transaction?

Serviced Tests On Serviced Components MyTestClass:ServicedComponent Transaction [Transaction( Required or supported) MySimpleClass:ServicedComponent SomeOtherClass

Serviced Tests On Serviced Components (RequiresNew) MyTestClass:ServicedComponent Transaction Transaction 2 SomeOtherClass [Transaction (RequiredNew or NotSupported) MySimpleClass:ServicedComponent

COM+ 1.5 MbUnit XtUnit System.Transactions

COM+ 1.0 Vs. 1.5  1.5 requires Win XP SP 2 or higher WinServer 2003 SP1 or higher  Otherwise – you have to use 1.0

ServiceConfig ServiceDomain

System.Transactions (.NET 2.0) Using(TransactionScope scope = new TransactionScope) { …do DB work here }  Automatic promotion of transactions  Very simple syntax  None  ADO.NET Transaction  Distributed Transaction (COM+)

XtUnit Pros  Decide per test on rollback behavior  Create your own attributes easily  Tools.osherove.com

MbUnit features  SqlRestore Info: Slow Requires exclusive DB access  Rollback Com+ 1.5

XUNIT.NET   [AutoRollback]  Extensible

Types of data layers  Table Data Gateway  Row Data Gateway  Active Record  Data Mapper  Book: “Patterns of Enterprise Application Architecture” Martin Fowler

Tests Against NHibernate Based Apps MyTestClass Transaction MyClass NHibernate

Tests Against ActiveRecord MyTestClass Transaction MyActiveCategoryClass NHibernate

Demo

Summary  DB Integration tests are necessary  Try combination of DB tests Application-integration tests  DataDude is your friend!  Use frameworks System.Transactions XtUnit MbUnit

A song by Roy Osherove (+ Simon & Garfunkel)

ISerializable.com (blog)

Resources  PoEAA Book  NHibernate  ActiveRecord  XtUnit  MbUnit  NUnit  DataDude  Database Unit Testing article  DataSet compare  The Art of Unit Testing Book  Roy’s Blog: ISerializable.com