Unit testing involves testing individual units or components of code, such as classes or methods, in isolation from the rest of the code base. A unit test asserts certain conditions or tests for specific behaviors and returns a pass/fail result. The purpose of unit testing is to validate that each piece of code works as intended, allowing code to be refactored with confidence and problems to be identified early. Best practices for unit testing include writing tests for new code, designing code for testability, and following an arrange-act-assert structure. Tests should be fast, isolated, and clearly named. Unit testing promotes code quality, documentation, and easier refactoring.
Test Driven Development - Phương pháp phát triển phần mềm theo hướng viết test trước.
Áp dụng TDD sẽ đem lại cho bạn thiết kế phần mềm trong sáng hơn và quản lý được chất lượng từng dòng code của mình viết ra.
Bài trình bày của bạn Lê Anh tại Meetup của Ha Noi .NET Group.
Chi tiết vui lòng xem tại: http://tungnt.net
Lightening Talk I gave at Inaka in May 2014.
This is sort of the continuation of my previous iOS TDD talk.
Since TDD and DI go quite hand in hand and they are both extend concepts to learn in one shot, I had to prepare a completely separated talk for spreading to my fellows the DI knowledge I had acquired.
In this experiential webinar, our guest Mohamed Shaaban will share with you his wide experience in Unit Testing in addition to practical techniques for unit testing your code using C#, NUnit, and Moq.
Getting Unstuck: Working with Legacy Code and DataCory Foy
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This workshop is designed specially for Queen Mary University of London alumni, in order to teach them TDD.
You will learn: What is TDD, Why and How.
If you want to learn more: https://github.com/MyPitit/TDD
Test driven development (TDD), a software development method, helps build high quality applications faster. Life-cycle, usefulness, limitations and similar techniques of TDD have been presented in this slide deck.
4 Nisan 2015 tarihinde Kadir Has Üniversitesi'nde yapılan 9. Yazılım Teknolojileri Seminer etkinliğinde Eralp Erat'ın yaptığı TDD (Test Driven Design) sunumu
What is main difference between Behavior Driven Development and Acceptance Test Driven Development? How can we start using one of these practices. What books should you read to get more details about Testing By Specification?
Lightening Talk I gave at Inaka in April 2014.
I was in charge of investigating test-driven development for our iOS mobile team. Since I realized it was such a big concept, after having gathered enough information and having played with it enough, I decided to introduce my fellows on the topic by presenting it in a formal talk with slides. The aim was teaching them a different way of developing, which, for us, at that moment, was completely new and controversial.
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TDD is an enormous topic so this really just scratches the surface to give an expansive glimpse into the journey that TDD truly is. Those unfamiliar with TDD will hopefully have a desire to learn more about it while those familiar will hopefully learn something new.
Test Driven Development - Phương pháp phát triển phần mềm theo hướng viết test trước.
Áp dụng TDD sẽ đem lại cho bạn thiết kế phần mềm trong sáng hơn và quản lý được chất lượng từng dòng code của mình viết ra.
Bài trình bày của bạn Lê Anh tại Meetup của Ha Noi .NET Group.
Chi tiết vui lòng xem tại: http://tungnt.net
Lightening Talk I gave at Inaka in May 2014.
This is sort of the continuation of my previous iOS TDD talk.
Since TDD and DI go quite hand in hand and they are both extend concepts to learn in one shot, I had to prepare a completely separated talk for spreading to my fellows the DI knowledge I had acquired.
In this experiential webinar, our guest Mohamed Shaaban will share with you his wide experience in Unit Testing in addition to practical techniques for unit testing your code using C#, NUnit, and Moq.
Getting Unstuck: Working with Legacy Code and DataCory Foy
From this presentation for the IASA in 2007, Cory covers common challenges in dealing with Legacy Code and Data, and some tools and techniques for handling them.
This workshop is designed specially for Queen Mary University of London alumni, in order to teach them TDD.
You will learn: What is TDD, Why and How.
If you want to learn more: https://github.com/MyPitit/TDD
Test driven development (TDD), a software development method, helps build high quality applications faster. Life-cycle, usefulness, limitations and similar techniques of TDD have been presented in this slide deck.
4 Nisan 2015 tarihinde Kadir Has Üniversitesi'nde yapılan 9. Yazılım Teknolojileri Seminer etkinliğinde Eralp Erat'ın yaptığı TDD (Test Driven Design) sunumu
What is main difference between Behavior Driven Development and Acceptance Test Driven Development? How can we start using one of these practices. What books should you read to get more details about Testing By Specification?
Lightening Talk I gave at Inaka in April 2014.
I was in charge of investigating test-driven development for our iOS mobile team. Since I realized it was such a big concept, after having gathered enough information and having played with it enough, I decided to introduce my fellows on the topic by presenting it in a formal talk with slides. The aim was teaching them a different way of developing, which, for us, at that moment, was completely new and controversial.
Common Challenges & Best Practices for TDD on iOSDerek Lee Boire
Presented at the June 2016 Tokyo iOS Meetup on 6/11/2016, in this presentation I give an overview of test driven development and how it can be used when developing for iOS / Swift.
TDD is an enormous topic so this really just scratches the surface to give an expansive glimpse into the journey that TDD truly is. Those unfamiliar with TDD will hopefully have a desire to learn more about it while those familiar will hopefully learn something new.
An Introduction To Software Development - Test Driven Development, Part 1Blue Elephant Consulting
This presentation is a part of the COP2271C college level course taught at the Florida Polytechnic University located in Lakeland Florida. The purpose of this course is to introduce Freshmen students to both the process of software development and to the Python language.
The course is one semester in length and meets for 2 hours twice a week. The Instructor is Dr. Jim Anderson.
A video of Dr. Anderson using these slides is available on YouTube at:
http://youtu.be/bCp1fbAd56k
Ever tried doing Test First Test Driven Development? Ever failed? TDD is not easy to get right. Here's some practical advice on doing BDD and TDD correctly. This presentation attempts to explain to you why, what, and how you should test, tell you about the FIRST principles of tests, the connections of unit testing and the SOLID principles, writing testable code, test doubles, the AAA of unit testing, and some practical ideas about structuring tests.
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The European Union Agency for Law Enforcement Cooperation (Europol) has suffered an alleged data breach after a notorious threat actor claimed to have exfiltrated data from its systems. Infamous data leaker IntelBroker posted on the even more infamous BreachForums hacking forum, saying that Europol suffered a data breach this month.
The alleged breach affected Europol agencies CCSE, EC3, Europol Platform for Experts, Law Enforcement Forum, and SIRIUS. Infiltration of these entities can disrupt ongoing investigations and compromise sensitive intelligence shared among international law enforcement agencies.
However, this is neither the first nor the last activity of IntekBroker. We have compiled for you what happened in the last few days. To track such hacker activities on dark web sources like hacker forums, private Telegram channels, and other hidden platforms where cyber threats often originate, you can check SOCRadar’s Dark Web News.
Stay Informed on Threat Actors’ Activity on the Dark Web with SOCRadar!
AI Pilot Review: The World’s First Virtual Assistant Marketing SuiteGoogle
AI Pilot Review: The World’s First Virtual Assistant Marketing Suite
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https://sumonreview.com/ai-pilot-review/
AI Pilot Review: Key Features
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See My Other Reviews Article:
(1) TubeTrivia AI Review: https://sumonreview.com/tubetrivia-ai-review
(2) SocioWave Review: https://sumonreview.com/sociowave-review
(3) AI Partner & Profit Review: https://sumonreview.com/ai-partner-profit-review
(4) AI Ebook Suite Review: https://sumonreview.com/ai-ebook-suite-review
Check out the webinar slides to learn more about how XfilesPro transforms Salesforce document management by leveraging its world-class applications. For more details, please connect with sales@xfilespro.com
If you want to watch the on-demand webinar, please click here: https://www.xfilespro.com/webinars/salesforce-document-management-2-0-smarter-faster-better/
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2. What is a Unit test?
Unit testing is testing of units in your code
base
3. “
The unit in question could be a Class
or a Method...
4. What is NOT a unit test???
◦ Developer Testing. Compiling
and running the application to
see if it does what you want it
to do is not unit testing.
5. What is NOT a unit test???
◦ Smoke/ Quality Testing. Running
an automated test that chugs
through a laundry list of
procedures involving large
sections of your code base is
not a unit test. This is the way
the QA department does
testing.
6. What is NOT a unit test???
◦ Things that involve databases,
files, web services, device
drivers or other things that are
external to your code. These are
called integration tests and they
test a lot more than just your
code.
7. “
The fact that something is
automated does not make it a unit
test
8. What is the purpose of Unit Testing?
Testing is, at its core,
experimentation. We’re just so
used to the hypothesis that our
code will work and that tests will
confirm that to be the case. Or
NOT!
9. What is the purpose of Unit Testing?
Testing at the unit level is about
running experiments on classes
and methods and capturing those
experiments and their results via
code.
10. What is the purpose of Unit Testing?
So unit testing is part of quality
assurance, but it isn’t itself quality
assurance, per se. Rather, it’s a
way of documenting and locking in
the behavior of the finest-grained
units of your code – classes – in
isolation.
11. What is the purpose of Unit Testing?
By understanding exactly how all
of the smallest units of your code
behave, it is straightforward to
assemble them predictably into
larger and larger components and
thus construct a well-designed
system.
13. Basic Principles
◦ Unit tests are just methods that
are decorated with annotations
(Java) or attributes (C#) to
indicate to the unit test runner
that they are unit tests. Each
method is generally a test.
◦ A unit test runner is simply a
program that executes
compiled test code and
provides feedback on the
results.
14. Basic Principles
◦ Tests will generally either pass
or fail, but they might also time
out or be inconclusive
◦ Tests will generally either pass
or fail, but they might also time
out or be inconclusive,
depending on the tooling that
you use.
15. Basic Principles
◦ Unit tests are simple and
localized. They should not
involve multi-threading, file I/ O,
database connections, web
services, etc. If you’re writing
these things, you’re not writing
unit tests but rather integration
tests.
16. Basic Principles
◦ Unit tests are fast. Your entire
unit test suite should execute in
seconds or quicker.
◦ Unit tests run in isolation, and
the order in which they’re run
should not matter at all. If test
one has to run before test two,
you’re not writing unit tests.
17. Basic Principles
◦ Unit tests should not involve
setting or depending on global
application state such as public,
static, stateful methods,
singletons, etc.
19. Arrange
What this means is that you start
off the test by setting up the class
instance in the state you want it
(usually by instantiating it and
then whatever else you want),
24. WOW
◦ Kind of a dense looking code
there…
◦ How do we know if this works?
◦ Run the entire application to see
if its blows up?
◦ But this is a pretty simple
method in a pretty simple class.
Doesn’t it seem like there ought
to be a way to make sure it
works?
25. But never fear
◦ Kind of a dense looking code
there…
◦ How do we know if this works?
◦ Run the entire application to see
if its blows up?
◦ But this is a pretty simple
method in a pretty simple class.
Doesn’t it seem like there ought
to be a way to make sure it
works?
27. Why do we want to do this?
◦ Well, might be that you or
someone else later starts
playing around with the
implementation of IsPrime().
◦ Maybe you want to make it
faster.
◦ Maybe you realize it doesn’t
handle negative numbers
properly and aim to correct it.
◦ ETC!
29. Donts
◦ Units test are granular!
◦ If something fails, you dont
know what
30. Donts
◦ Units test are granular!
◦ If something fails, you dont
know what!
31. “
“Unit tests don’t just magically
spring up like mushrooms after a
few days of rain. They’re more like
roses – you have to plan for them
from the start and carefully
cultivate an environment in which
they can thrive.”
32. How to get started!
◦ Test New Classes Only
◦ Test Existing Code by Extracting
Little Classes
◦ Just do it!
33. Things that are hard to test
◦ Calls static methods.
(is that they manipulate some kind
of global state.)
◦ Invokes singletons .
◦ Dispatches background workers
◦ Accesses files, connects to
databases, calls web services,
etc.
◦ Has classes that require crazy
amounts of instantiation.
34. Things that are hard to test
◦ For now just stay away from all
of these...
36. Designs that are bad for testing
◦ Active Record
This architecture tightly couples
your database to your domain
logic and your domain logic to
the rules for navigating through
domain objects.
◦ WinForms / Webforms / Code
behind stuff
37. Monolithic Code
◦ Picture two methods. One is a
700-line juggernaut with more
control flow statements than
you can keep track of without a
spreadsheet. The other is five
lines long, consisting only of an
initialize statement, a foreach,
and a return statement. With
which would you rather work?
39. Procedural Code
◦ Stay away from this sort of
Code
◦ Unit testing is about
deconstructing things into
smaller possible chunks
40. Procedural Code
◦ Stop thinking in when and start
thinking in what
◦ If you were thinking about
“what” first here, you would
form a much different mental
model of a person’s day. You’d
say things to yourself like, “well,
during the course of a person’s
day, he probably wakes up, gets
dressed, eats breakfast – well,
actually eats one or more meals
41. Other Design Considerations for Your
New Classes
◦ Avoid using fields to
communicate between your
methods by setting flags and
tracking state. Favor having
methods that can be executed
at any time and in any order.
◦ Don’t instantiate things in your
constructor. Favor passing them
in.
42. Other Design Considerations for Your
New Classes
◦ Similarly, don’t have a lot of
code or do a lot of work in your
constructor. This will make your
class painful to setup for test.
◦ In your methods, accept
parameters that are as
decomposed as possible. For
instance, don’t accept a
Customer object if all you do
with it is read its SSN property.
46. Still dont want to Unit Test?
◦ Improve code quality
◦ Document the code
◦ Exercise Code
◦ Promote good design
◦ Help break problems into
manageable chunks
◦ Expose problems eairler
◦ Its cheaper to find problems
◦ Allow easier refactoring without
hesitation
47. Still dont want to Unit Test?
◦ Improve code quality
◦ Document the code
◦ Exercise Code
◦ Promote good design
◦ Help break problems into
manageable chunks
◦ Expose problems eairler
◦ Its cheaper to find problems
◦ Allow easier refactoring without
hesitation
48. Still dont want to Unit Test?
◦ Its easier to write code with unit
tests
49. Other considerations
◦ Name Your Tests Clearly and Be
Wordy
◦ Dont name your test like:
Test24, CustomerTest,
◦ Use:
◦ “Customer_IsValid_Returns_Fals
e_When_Customer_SocialSecur
ityNumber_Is_Empty”.
50. Other considerations
◦ Make your test suit fast. A good
test suit runs in seconds
◦ Test code is nice code
◦ Have a single assert per case
◦ Dont share states between your
test
◦ Encourage Others and Keep
Them Invested
51. References
◦ Michael Feathers “The Deep
Synergy Between Testability
and Good Design.” Video
◦ Starting to unit test, not as hard
as you think (Book)
◦ The art of unit test (Second
Edition) Book!