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Coding NakedUnit Testing Those Hard to Reach Places

Caleb JenkinsTechnology LeaderQuicken Loans

U n i t Te s t i n g t h o s e h a r d t o r e a c h p l a c e s !

Coding Naked!

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Tuesday

Wednesday

Wednesday

Automated Unit Test

Fundamentals

Hard to Reach Places

Coding Naked

back to…

Is TDD only for coding elites?

or something for every developer?

How do we make Automated Tests the norm?

make coding without tests as

uncomfortable as coding naked

* this is not me

15

what are the 4 big parts of unit tests?what are the 4 big parts of unit tests?

Test Framework Test Runner

Code Tests

16

your applicationwhat you want to test

your test codethe code that tests the

code that you wrote or are going to write

attributes and assertsthe framework provides

the attributes and asserts so we know what the tests

are doing. Examples: nUnit jUnit

cppUnit

runs the testsoften associated with the

test framework; is distinctly separate.

sometime integrated in IDE, CI Server or stand

alone exe

Test Runner

17

Code

Test

Fra

me

wo

rk

Tests

Tests

Tests

Tests

Tests

Start

ATest RunnerB

C Test Code

Test Framework

19

Test Framework

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github.com/tpierrain/NFluent

github.com/erichexter/Should

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nUnit Test Runner

Test Runners

21

Visual Studio (VS Test)

CodeRush / ReSharperContinuous Integration (Team City)

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3 A’s

22

Arrange– Set up the scenario and the initial input values. Often in a

common [TestFixtureSetup] or [Setup] method

Act - Action that creates the outcome that is being tests, usually

calling some method in your code to test the result.

Assert – Is a boolean statement to your testing framework to

declare the expected outcome. Results in Pass or Fail

Arrange Act Assert

Test Code

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Data Access

Data Logic

Integration Service Proxy

App Domain Domain Validation

UI Logic

UI

Building better Lego’s

Tests are small

Tests are fast

Tests focus on one thing

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Red

GreenRefactor

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Test Runner

return valuesno dependencies…

App Domain Domain Validation

UI Logic

Test Code

Unit Tests focus on a UnitTest a unit in isolation from other unitsControl input => Testable output

Simple Tests

VSTest

Start

Test Runner

Test Code

Test Framework

Set the Scene

as a <role>,I will <function>so that <value>

Defining BehaviorDiscussion

what if our “tests”

given <class> to testwhen <setup> scenariothen <test> outcome

matched ourlanguage?

Discussion

Discussion

BDD

Resources & Frameworks

BDDhttp://neelnarayan.blogspot.com/2010/07/bdd-is-more-than-tdd-done-right.html

more than TDD done right

http://dannorth.net/introducing-bdd/

introducing BDD

http://lucisferre.net/2011/02/05/behavior-driven-test-driven-domain-driven-design/

behavior driven, test driven, domain driven

nBehave, nSpec, SpecFlow, StoryQ, mSpec, StorEvil

Handle your dependencies

Dependencies“The single greatest thing that you can do to make your code more testable and healthy is to start taking a Dependency Injection approach to writing software”

Dependencies“The single greatest thing that you can do to make your code more testable and healthy is to start taking a Dependency Injection approach to writing software”

- Real World .NET, C# and SilverlightWrox Press 2012

Caleb Jenkins

- Real World .NET, C# and SilverlightWrox Press 2012

Caleb Jenkins

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Data Access

Data Logic

Integration Service Proxy

App Domain Domain Validation

UI Logic

UI

How do you test this

with thesedependencies

Harder to Test

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Data Access

Data Logic

Integration Service Proxy

App Domain Domain Validation

UI Logic

UI

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Test Runner

Test Code

Integration Service Proxy

App Domain Domain Validation

UI Logic

Dependency Injection + InterfacesFaked dependencies to increase unit isolationLeverage mocking frameworks makes life better

Note:Dependency InjectionNote:Dependency Injection

will turn you in to a complete coding Ninja, however the full scope of DI with any of the many DI frameworks is beyond the scope of this talk

will turn you in to a complete coding Ninja, however the full scope of DI with any of the many DI frameworks is beyond the scope of this talk

http://developingUX.com/DI/

http://developingUX.com/DI/

- Real World .NET, C# and SilverlightWrox Press 2012

Caleb Jenkins

- Real World .NET, C# and SilverlightWrox Press 2012

Caleb Jenkins

Mocking Framework“A mocking framework allows you to create fake classes on the fly in-line with your test code. That is a bit of a simplification, mocking frameworks use a combination of emits, reflection and generics to create run-time instance implementations of .NET Interfaces – whew, that’s a mouthful - it’s a whole lot easier to say that they create fake classes on the fly!”

Mocking Framework“A mocking framework allows you to create fake classes on the fly in-line with your test code. That is a bit of a simplification, mocking frameworks use a combination of emits, reflection and generics to create run-time instance implementations of .NET Interfaces – whew, that’s a mouthful - it’s a whole lot easier to say that they create fake classes on the fly!”

Microsoft.Fakes

Bringing DI togetherBringing DI together

IData mockData = MockRepository.GenerateMock<IData>();

mockData.Expect(x => x.getAll<account>()).Return(sampleAccounts).Repeat.Once();

IAccountServices accountService= new AcmeAccountService(mockData);

var act = accountService.GetAccount(known_account_id);

mockData.VerifyAllExpectations();

Start(Framework, Runner, Test Code)

Set the Scene

Handle your Dependencies

the problem with edges

UI DataBusiness

Edges areHard to Test

Testing edges can be like

testing to see if you’re good

at cliff jumping

That’s not me

..or you’restuff on a rock.

You’re either an expert and it works…

UI DataDataLogic

UILogicBusiness

Edges areHard to Test

Edges are stillHard to Test

by separating UI/Data edges fromUI/Data logic we’re increasing the testable area

we’ve also made it easier to implementvarious UI and Data platforms

without affecting the application logic

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Edges are all around us

Data

UI

Net

wor

k Disk IO

Edges are all around us

Net

wor

k

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Edges are all around us

INet

wor

kPro

xyRe

try L

ogic

/ For

mat

ting

Data

UI

Net

wor

k Disk IO

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https://github.com/calebjenkins/Acme.CodingNaked

These examples are for the expressed purpose ofdemonstrating unit testing scenarios.. none of this code(especially the supporting non-testing code) isintended to be deployed in production scenarios. Thisis just some code from a talk at some conference oruser group. There's no warranty, express or implied.Works on my machines. I don't know you and I don'tknow how you got here. Stop calling. I no live here,you no call back!

“Don’t be silly”- Roy Osherove

The Art of Unit Testingpg. 77

the problem with statics

shared state be like..

IDependency

IdependencyExtensionMethod

Class to Test

IdependencyMethod

Idependency Method

IdependencyMethod

the challenges with Microsoft Fakes

Identify your edges

Keep the edges dumb

Stop coding naked

StartFramework, Runner, Test Code

Set the Scene

Handle your Dependencies

no, seriously

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