unit testing 101

some tests yo!You need

Dave Bouwman // CTO // DTSAgile

the “big” ideas

provecode

works

designprove

works

catchregression

101unit testing

Call Method…

Check Results…

Call Method…

Check Results…

Instantiate class under test…

independent

good tests are…

repeatable

self-contained*

professional

focused

good tests are…

tools!

“unit testingon crack”

Scott Hanselmanwww.hanselman.com

testswriting

simple methods

mean simple tests

with simple signatures

mean…

complex methodswith complex signatures

complex tests

most

category

ArcObjectsapplications

fall in this

design we mustfor testing

separationof concerns

singlea class has

purpose

stayinside

itsbox

(events + logic + data access)user interface

private void ButtonOn_Click(){

//read values from controls

//update interface

}

//apply business logic//connect to database//update data

objectsbusiness

objectsdata access

objectsuser interface

Private void ButtonOn_Click(){

//read values from controls

//update interface

}

//apply business logic//connect to database//update data

public class

}

//apply business logic//send changes to DAL

architecturen-tier

objectsbusiness

objectsdata access

objectsuser interface

testsunit

WPF/Silverlight

patterns yodesign

modelviewcontroller

released!!ASP.NET MVC

http://asp.net/mvc

managementdependency

dependencies

created

constructorby the

1

private IAccountRepository _accountRepository;private IFormsAuthentication _formsAuthentication;private ILogService _logger;

public AccountController(){

_accountRepository = new AccountRepository(_connectionString);

_logger = new Logger();_formsAuthentication = new FormsAuthentication();

}

what abouttesting

independent

good tests are…

repeatable

self-contained*

professional

“tight coupling”

externaldependencies

in thetests

dependenciesinternal

separateand

them

pass

constructorinto the

2dependencies

dependencyinjection

private IAccountRepository _accountRepository;private IFormsAuthentication _formsAuthentication;private ILogService _logger;

public AccountController(IAccountRepository accountRepository, IFormsAuthentication formsAuthentication, ILogService logger)

{_accountRepository = accountRepository;_formsAuthentication = formsAuthentication;_logger = logger;

}

problempushed

the

up alevel

of controlinversion

configurationGlobal.asax.cs

I need an AccountController!

mvccontrib IoC Spring.NET

StructureMap

Castle Windsor

Unity

http://mvccontrib.codeplex.com

unit testing…back to

isolatedtesting

&mockfakes

stubs

wrotecode you

on-the-flygenerated

objectsfake

objectsstub/mock

tools!

rhinomocks

http://ayende.com/projects/rhino-mocks.aspx

ArcMapdevelopment

notour

box

separatelogicfrom

wiring

ArcMapevents

emulate

from

sinks…my code

Shim

ArcMapin

ArcMap

IEditEventsBusiness

Logic

testunder

BusinessLogic

TestBusiness

Logic

yourtest

code

ESRI’snot

ArcEngineApplications

it’sour

box

designmatters.

ArcGISServer

Web ADF…testing

servicescustom

ArcGIS Server

WebService

SOC

COMUtility

COMUtilities

ArcGIS Server

WebService

SOC

SOE

ServerObjectExtensions

COMUtility

(ArcObjects)SOECOM

Utility(ArcObjects)

IServerObjectExtension

testableclasses

cool for COM…but i’m too

jsunit

FlexUnit

Silverlight Harness

D.O.H. Unit Testing

resourceshttp://mvccontrib.codeplex.com

http://castleproject.org

http://ASP.NET/mvc

http://ayende.com/projects/rhino-mocks.aspx

http://testdriven.net

http://mbunit.com

writin teztz!i’m in teh codez

can too!and nao u

questionshttp://twitter.com/dbouwman

http://slideshare.com/dbouwman

http://blog.davebouwman.net

dbouwman@dtsagile.com