http://www.depthconsulting.ca

http://www.depthconsulting.ca

DeveloperFundamentals:The Series

Calgary.NET User Group

Nov. 26, 2014

Unit TestingA Brief Explanation

Dave WhiteMicrosoft MVP – Visual Studio ALM

http://www.depthconsulting.ca

Developer Fundamentals Series

Testing – Nov. 26, 2014

SOLID – February

Dependency Injection – April

Source Control – Branching/Merging – June

Putting It All Together – July

http://www.depthconsulting.ca

Dave White Principal Consultant – Depth Consulting

http://linkd.in/giMxuw

@AgileRamblings

• In IT for over 15 years

• Microsoft MVP – Visual Studio ALM

• Kanban/Agile Evangelist, Speaker

• PRDC 2011, 2012, LKUK, Local events

• Program Director – KCP Program - LKU

• Professional Scrum Master

• Microsoft Platform Developer (C#, Web, WPF)

http://www.agileramblings.com

http://www.depthconsulting.ca

Simon TimmsSenior .NET Dev – Pacesetter Directional Drilling

http://linkd.in/15pYAWL

@stimms

• In IT for over a decade (+/− few months)

• Microsoft MVP – ASP.NET/IIS

• Prolific Speaker and Community Involvement

• PRDC (many), AzureCamp, Local events

• Calgary .NET User Group – President

• Author

• Loves Development

• Polyglot

• Web apps, .NET back ends

• Visualization and Cloud

http://blog.simontimms.com/about/

http://www.depthconsulting.ca

WHY?

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Why We Don’t Test• No one around me is doing it

• Too hard to learn

• No tools

• My stuff doesn’t need it

• Bugs aren’t my problem

• Our code is horrible

• No time

• Manager won’t let me (cost or time)

• Maintain my tests now too?!?!

• We have QA people

http://www.depthconsulting.ca

The truth of the matter…• Everyone is doing it

• Easier than ever

• Investment in tools• Private and OSS

• Increasing Complexity• Business and technical

• Late discovery of defects is expensive

• You can start small

• QA demand growing

• You will be a better developer

• Drives growth down maturity path

• It makes you faster

• Less time on bugs

• More time on fun

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I got this!

By Adam Jones Adam63 (Own work) [CC-BY-SA-3.0

(http://creativecommons.org/licenses/by-sa/3.0)],

via Wikimedia Commons

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Types of TestsUnit Test (TDD, BDD or Test After)

One class, One Method, One Scenario per Test

Not Unit Test

Integration Test

Multiple classes/methods

Feature Test

Multiple classes/method/scenarios

Database Tests

Single class/method – multiple boundaries

UI Tests (Automated or manual)

Functional test of application

Load Testing

My system sure can carry the load!

Performance Testing

My unit is very performant.

Usability Testing

That’s a good looking unit!

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Unit Test Sub-TypesBehaviour

• Concerned with interactions between dependent objects

• Did Object A user Object B correctly

• Requires mocking framework

State

• Concerned only with object mechanics

• Typically faking data in stubs (don’t need mocking framework)

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Anatomy of a Test

[TestClass] (or Fixture)

Used to identify classes that contain test methods

[TestInitialize] (or Setup)

Identifies the method to run before the test to allocate and configure resources needed by all of the tests

[TestMethod] (Test, Fact, or

Theory)

Used to identify test methods

[TestCleanup] (or Teardown)

Identifies the method to run after the tests to free resources allocated during the test run

[Ignore]

sut or cut = subject or class under test

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Basic LayoutTestClass

public class

TestMethod

public void

// arrange

// act

// assert

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Unit Test Frameworks

http://en.wikipedia.org/wiki/List_of_unit_testing_frameworks

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Demo

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By Crosa (Flickr: Scream) [CC-BY-2.0

(http://creativecommons.org/licenses/by/2.0)],

via Wikimedia Commons

YOU CAN’T MAKE ME TEST FIRST!!

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Pivot – Test Driven Development• TDD is mostly a change in perspective

• NOT ABOUT TESTING• A wonderful side effect

• Unit Tests intend to characterize or “pin down” behavior

• TDD intend to design classes

• First create a hypothesis about your class

• Create your class aligned with hypothesis

• Run experiment

• Rinse & Repeat

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Demo

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By FelipeIbazeta (Own work) [CC-BY-SA-3.0

(http://creativecommons.org/licenses/by-sa/3.0)],

via Wikimedia Commons

HUH?!?

My tests should be about business?

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Pivot – Behaviour Driven Development• BDD is mostly about describing things different

• TestClass Per Scenario

• NOT ABOUT TESTING• A wonderful side effect

• Create a business language scenario

• Setup the world to model your situation

• Run the scenario• Probably multiple assertions in a TestClass

• Rinse & Repeat

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Just tilt your head…

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These are not the demos your looking

for…

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QA Pros are people too!

(This guys last name is really Tester!)

By U.S. Government (http://tester.senate.gov/)

[Public domain],

via Wikimedia Commons

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Pivot – There is No Unit in UI• UI Testing is still good!

• Just not a unit test

• Automated or Manual• Design your tests - Describe them in

Test Cases

• Execute them

• Automate them

• <INSERT DEVELOPER HERE>

• Maintain them

• <INSERT MORE DEVELOPER HERE>

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Microsoft Developers UI Testing• Coded UI Testing

http://msdn.microsoft.com/en-us/library/dd286726.aspx

• Selenium http://www.seleniumhq.org/

• WatiNhttp://watin.org/

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Hold on a second here Mister!

By Achim Hering (Own work)

[GFDL (http://www.gnu.org/copyleft/fdl.html) or

CC-BY-3.0 (http://creativecommons.org/licenses/by/3.0)],

via Wikimedia Commons

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The Real Truth - It Can’t Be All Roses• Testing is hard

• Only because it is:

• Unfamiliar – we don’t have these skills yet

• Burdened by a MOUNTAIN of technical debt and bad design

• You will be slower at first

• It may force you to learn new things• SOLID, DI, new Tooling

• These are all GOOD things!

• Managers may be suspicious

• You have to go slow… Start small!

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The Real Truth – There ARE Roses• You will get faster

• You will create higher quality product

• You will create better designs

• You will help your QA Professional teammates

• You don’t have to ask permission

• Most of the tools are free or inexpensive• You might already have them!!

• You will (eventually) have more fun! :D

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We can do this!

By Wonderlane from Seattle, USA [CC-BY-2.0

(http://creativecommons.org/licenses/by/2.0)],

via Wikimedia Commons

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Next Steps• Just go do it

• Do not give up

• Do not ask permission

• Do not give up

• Start small

• Do not give up

• Ask for help

• Do not give up

KEEPCALM

and

TESTON

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Tools• Visual Studio Community

http://www.visualstudio.com/products/visual-studio-community-vs

• Visual Studio 2015 Previewhttp://www.visualstudio.com/en-us/news/vs2015-preview-vs

• Nuget

• Nunit, xUnit• http://www.nunit.org

• http://github.com/xunit/xunit

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I’ve Skipped a LOT• Mocking

• Refactoring

• SOLID

• Dependency Injecting

• Automation

• Code Coverage

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These are the MeetUps you’re looking for…

Testing – Nov. 26, 2014

SOLID – February

Dependency Injection – April

Source Control – Branching/Merging – June

Putting It All Together – July

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NOW PRIZES!!

2 ReSharper licences to the loudest Unit Testers in the room!!

https://www.jetbrains.com/resharper/

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ThanksDave White

@agileramblings

http://www.agileramblings.com

dave@depthconsulting.ca

Simon Timms

@stimms

http://blog.simontimms.com

stimms@gmail.com