Roy OsheroveSela GroupRoy@Osherove.com

ISerializable.com (blog)

About Me

Agile Development

Consulting Training Mentoring

www.TeamAgile.com

.NET

Architecture Practices More..

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 LayerDB

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+ 1.5System.Transactions

XtUnit MbUnit

Demo

Resetting an identity column

USE pubs GO

Delete from mytableGO

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+ 1.5MbUnitXtUnitSystem.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:SlowRequires exclusive DB access

RollbackCom+ 1.5

XUNIT.NET

http://www.codeplex.com/xunit

[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 testsApplication-integration tests

DataDude is your friend! Use frameworks

System.TransactionsXtUnitMbUnit

A song by Roy Osherove

(+ Simon & Garfunkel)

Roy@Osherove.com

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