Unit Testing - Calgary .NET User Group - Nov 26 2014 - Depth Consulting

http://www.depthconsulting.ca

Developer
Fundamentals
:
The Series
Calgary
.NET User
Group
Unit Testing
A Brief Explanation
Dave White
Microsoft MVP – Visual Studio ALM

Developer Fundamentals Series
Testing – Nov. 26, 2014
SOLID – February
Dependency Injection – April
Source Control – Branching/Merging – June
Putting It All Together – July

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

Simon Timms
Senior .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/

WHY?

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

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

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

Types of Tests
Unit 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

Unit Test Sub-Types
Behaviour
• 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)

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
[Ignor
e]
sut or cut = subject or class under test

Basic Layout
TestClass
public class
TestMethod
public void
// arrange
// act
// assert

Unit Test Frameworks
http://en.wikipedia.org/wiki/List_of_unit_testing_frameworks

Demo

By Crosa (Flickr: Scream) [CC-BY-2.0
(http://creativecommons.org/licenses/by/2.0)],
YOU
CAN’T
MAKE
ME
TEST
FIRST!!

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

By FelipeIbazeta (Own work) [CC-BY-SA-3.0
(http://creativecommons.org/licenses/by-sa/3.0)],
HUH?!?
My tests
should
be about
business?

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

Just tilt your head…

These are not the
demos your looking
for…

QA Pros
are
people
too!
(This guys last name is
really Tester!)
By U.S. Government (http://tester.senate.gov/)
[Public domain],

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>

Microsoft Developers UI Testing
• Coded UI Testing
http://msdn.microsoft.com/en-us/library/dd286726.aspx
• Selenium
http://www.seleniumhq.org/
• WatiN
http://watin.org/

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)]

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!

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

We can
do this!
By Wonderlane from Seattle, USA [CC-BY-2.0
(http://creativecommons.org/licenses/by/2.0)],

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
KEEP
CALM
and
TEST
ON

Tools
• Visual Studio Community
http://www.visualstudio.com/products/visual-studio-community-vs
• Visual Studio 2015 Preview
http://www.visualstudio.com/en-us/news/vs2015-preview-vs
• Nuget
• Nunit, xUnit
• http://www.nunit.org
• http://github.com/xunit/xunit

I’ve Skipped a LOT
• Mocking
• Refactoring
• SOLID
• Dependency Injecting
• Automation
• Code Coverage

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

NOW PRIZES!!
2 ReSharper licences to the loudest Unit
Testers in the room!!
https://www.jetbrains.com/resharper/

Thanks
Dave White
@agileramblings
http://www.agileramblings.co
m
dave@depthconsulting.ca
Simon Timms
@stimms
http://blog.simontimms.com
stimms@gmail.com

Unit Testing - Calgary .NET User Group - Nov 26 2014 - Depth Consulting

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Unit Testing - Calgary .NET User Group - Nov 26 2014 - Depth Consulting