The original promise of TDD was that it would assist in guiding the development of clean code, but it often ends up polluting our architecture with excessive composition, is expensive to write, and becomes an obstacle to change, not an aid to refactoring. In this talk, we look at the fallacies of TDD and learn about the key principles that we should be following for mastery of this practice. This talk is intended for those who have been practicing TDD, or who have tried TDD and given up because of shortcomings in the approach they were taught.
What is Node.js | Node.js Tutorial for Beginners | Node.js Modules | Node.js ...Edureka!
This Edureka "What is Node.js" tutorial will help you to learn the Node.js fundamentals and how to create an application in Node.js. Node.js is an open-source, cross-platform JavaScript runtime environment for developing a diverse variety of server tools and applications. Below are the topics covered in this tutorial:
1) Client Server Architecture
2) Limitations of Multi – Threaded Model
3) What is Node.js?
4) Features of Node.js
5) Node.js Installation
6) Blocking Vs. Non – Blocking I/O
7) Creating Node.js Program
8) Node.js Modules
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 Node.js | Node.js Tutorial for Beginners | Node.js Modules | Node.js ...Edureka!
This Edureka "What is Node.js" tutorial will help you to learn the Node.js fundamentals and how to create an application in Node.js. Node.js is an open-source, cross-platform JavaScript runtime environment for developing a diverse variety of server tools and applications. Below are the topics covered in this tutorial:
1) Client Server Architecture
2) Limitations of Multi – Threaded Model
3) What is Node.js?
4) Features of Node.js
5) Node.js Installation
6) Blocking Vs. Non – Blocking I/O
7) Creating Node.js Program
8) Node.js Modules
4 Nisan 2015 tarihinde Kadir Has Üniversitesi'nde yapılan 9. Yazılım Teknolojileri Seminer etkinliğinde Eralp Erat'ın yaptığı TDD (Test Driven Design) sunumu
This is the slide deck from the popular "Introduction to Node.js" webinar with AMD and DevelopIntelligence, presented by Joshua McNeese. Watch our AMD Developer Central YouTube channel for the replay at https://www.youtube.com/user/AMDDevCentral.
How to Convert a Component Design into an MUI React CodeWrapPixel
Material UI or MUI library provides you with robust, customizable, accessible, and advanced components, enabling you to build your own design system and develop React applications faster. That includes a huge list of Material icons, foundational components with MUI Core, advanced and powerful components with MUI X, templates, and design kits!
Getting Started with Angular 4 and TypeScript
Slides:
1- What is TypeScript.
2- TypeScript Content
3- Why TypeScript
4- TypeScript Interfaces
5- TypeScript Decorators
6- TypeScript Import and Export
7- What is Angular JS
8- Angular Architecture Overview
9- Anatomy of an Angular Application
10- Setting up an Angular Application
11- Angular CLI
12- Running your application
13- Modules
14- Components
15- Templates
16- Metadata
17- Data binding
18- Pipes
19- Services and Service Creation
Behavior Driven development is the process of exploring, discovering, defining and driving the desired behavior of software system by using conversation, concrete examples and automated tests.
Angular vs React vs Vue | Javascript Frameworks Comparison | Which One You Sh...Edureka!
** Full Stack Web Development Training: https://www.edureka.co/masters-program/full-stack-developer-training **
This Edureka tutorial on Angular vs React vs Vue will help you in demystifying the fundamental differences between each of these JavaScript Frameworks. Following are the topics which are used for comparison:
Architecture Type
DOM
Application Type
Language Preference
Scalability
Ease Of Deployment
Data Flow
Learning Curve
Market Trend
Community & Support
Follow us to never miss an update in the future.
Instagram: https://www.instagram.com/edureka_learning/
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Twitter: https://twitter.com/edurekain
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In this article, we will talk about test cases and test scenarios. We will see their definitions and try to understand the differences between the two. These two are a part of software testing.
MVVM or Model - View - ViewModel is a design pattern aimed for modularising your code and build it on a Test Driven Development environment. When Apple's traditional MVC design pattern makes our controllers bulky and our unit tests painful, different design patterns such as MVVM, VIPER, MVP, etc come to our rescue. MVVM comes quite handy as it provides a loosely coupled mechanism between all components segregating your view, business and data logic.
This is the slide deck from the popular "Introduction to Node.js" webinar with AMD and DevelopIntelligence, presented by Joshua McNeese. Watch our AMD Developer Central YouTube channel for the replay at https://www.youtube.com/user/AMDDevCentral.
How to Convert a Component Design into an MUI React CodeWrapPixel
Material UI or MUI library provides you with robust, customizable, accessible, and advanced components, enabling you to build your own design system and develop React applications faster. That includes a huge list of Material icons, foundational components with MUI Core, advanced and powerful components with MUI X, templates, and design kits!
Getting Started with Angular 4 and TypeScript
Slides:
1- What is TypeScript.
2- TypeScript Content
3- Why TypeScript
4- TypeScript Interfaces
5- TypeScript Decorators
6- TypeScript Import and Export
7- What is Angular JS
8- Angular Architecture Overview
9- Anatomy of an Angular Application
10- Setting up an Angular Application
11- Angular CLI
12- Running your application
13- Modules
14- Components
15- Templates
16- Metadata
17- Data binding
18- Pipes
19- Services and Service Creation
Behavior Driven development is the process of exploring, discovering, defining and driving the desired behavior of software system by using conversation, concrete examples and automated tests.
Angular vs React vs Vue | Javascript Frameworks Comparison | Which One You Sh...Edureka!
** Full Stack Web Development Training: https://www.edureka.co/masters-program/full-stack-developer-training **
This Edureka tutorial on Angular vs React vs Vue will help you in demystifying the fundamental differences between each of these JavaScript Frameworks. Following are the topics which are used for comparison:
Architecture Type
DOM
Application Type
Language Preference
Scalability
Ease Of Deployment
Data Flow
Learning Curve
Market Trend
Community & Support
Follow us to never miss an update in the future.
Instagram: https://www.instagram.com/edureka_learning/
Facebook: https://www.facebook.com/edurekaIN/
Twitter: https://twitter.com/edurekain
LinkedIn: https://www.linkedin.com/company/edureka
In this article, we will talk about test cases and test scenarios. We will see their definitions and try to understand the differences between the two. These two are a part of software testing.
MVVM or Model - View - ViewModel is a design pattern aimed for modularising your code and build it on a Test Driven Development environment. When Apple's traditional MVC design pattern makes our controllers bulky and our unit tests painful, different design patterns such as MVVM, VIPER, MVP, etc come to our rescue. MVVM comes quite handy as it provides a loosely coupled mechanism between all components segregating your view, business and data logic.
xUnit and TDD: Why and How in Enterprise Software, August 2012Justin Gordon
“A comprehensive suite of JUnit tests is one of the most import aspects of a software project because it reduces bugs, facilitates adding new developers, and enables refactoring and performance tuning with confidence. Test-driven development (TDD) is the best way to build a suite of tests. And the Dependent Object Framework is the best way to test against database objects.” This presentation covers the benefits of TDD along with practical advice on how to implement TDD in complex projects.
A Study: The Analysis of Test Driven Development And Design Driven TestEditor IJMTER
There are various types of testing methods. In this paper, we have discussed TDD and
DDT. Test driven development method is a type of agile methodology. In this method, test drives the
design. Basically, TDD is a unit testing. It is a test-first approach method[15]. This method can be a
never ending process, because we are writing the test first, then writing the code to make the test
pass. If test fails then again we will change the code and then we will test again. Using this method,
defect rate can be reduced to 50%. But DDT cannot be a never ending process, because we design
first, then we implement that design any way. TDD is more complex to implement, while DDT is a
bit easier
Test-Driven Developments are Inefficient; Behavior-Driven Developments are a ...Abdelkrim Boujraf
In summary, we have presented here a method for efficiently testing large parts of web-based software by using elements of code generation to generate automatable tests, and by using BDD concepts to model tests for non-generated screens and non-generated business actions. Further, we have described a method for context-based unit
testing that, when combined with generated code and tests, yields an acceptable trade-off between development efficiency and time spent on testing
The Essentials Of Test Driven Development Rock Interview
Test Driven Development is the fastest method to get software onto the market. Being one of the most used methods in the present business world, here is why the method is essential.
We all hear how unit tests can ensure higher quality code and help us in day to day refactoring, but is it feasible to write and maintain unit tests in a fast paced startup company?
This is a presentation by server lead, Heine Frifeldt, on how unit tests was gradually introduced into the server code base at Loopt, which tools are used in the continuous build environment, coding techniques and lessons learned.
Similar to Ian Cooper webinar for DDD Iran: Kent beck style tdd seven years after (20)
دوازدهم خرداد ۱۴۰۱، میزبان دکتر «فریدون شمس علیئی» استاد دانشکده مهندسی و علوم کامپیوتر دانشگاه شهید بهشتی هستیم و با حضور ایشان، به معرفی و مرور جدیدترین کتابشان «اصول مهندسی نرمافزار پیشرفته برای مواجهه با پیچیدگی» خواهیم پرداخت.
در این گفتگو، دکتر شمس درباره انگیزه نگارش این کتاب و نیز ساختار و محتوای آن سخن خواهند گفت و به شرح و تفصیل بخشهایی از کتاب خواهند پرداخت.
شما با شرکت در این وبینار نه تنها با محتوای کلیدی این کتاب آشنا میشوید بلکه با دیدگاه گرانمایه دکتر شمس که برگرفته از تجربه و دانش عمیق ایشان در این حوزه است هم آشنا خواهید شد و میتوانید مسیر مطالعاتی دقیقتری برای خودتان رسم کنید.
این وبینار برای علاقهمندان به مباحث پیشرفته مهندسی نرمافزار سودمند خواهد بود و البته دانشجویان سالهای نخست دوره کارشناسی مهندسی نرمافزار هم میتوانند از این وبینار بهره بسیاری ببرند.
اگر در نگاه اول، عنوان معماری تميز (Clean Architecture) حس كنجكاوی شما را به خود جلب میكند، احتمالاً شما به معماری نرمافزاری كه در حال ساخت آن هستید اهميت ويژهایی میدهيد. به نوعی میتوان گفت مهمترين نيازمندی Non-functional يک نرمافزار، موضوع نگهداشت (Maintainabilty) آن است؛ به هر ميزان كه هزينه نگهداشت یک محصول نرم افزاری پايين و يا قابل قبول باشد، به مراتب سريعتر و كم هزينهتر میتوانيم قابليتهای جديدی به آن اضافه كنيم و يا چارهایی برای رفع مشكلات كارایی و مقياس پذيری آن بیندیشیم، و حتی رفع مشكلات امنيتی آن را نيز سریعتر کنیم.
محمد یگانهفر در اين ارائه به نحوه درست پياده سازی یک معماری تميز و ظرفيتهای اين شيوه در كنترل هزينه نگهداشت یک محصول نرمافزاری خواهد پرداخت.
کشف و شناسایی همواره جزو کارهای جذاب برای افراد ماجراجو است. اما آیا تا به حال برایتان پیش آمده که ذهنتان درگیر کشف و شناسایی مسایل در حوزهی نرمافزاری باشد که در توسعه آن نقش دارید؟
مسعود بهرامی، در این سخنرانی نشان خواهد که داد چگونه تکنیک EventStorming با تسهیل تعامل سازنده بین همه افراد درگیر در فرآیند توسعه ی محصول، میتواند به شما فرصت شناخت و کشف گروهی فرآیندهای کسب و کار در زمانی کوتاه را بدهد.
در این سخنرانی ارایه خواهد شد:
1. دستورالعمل برگزاری یک کارگاه موثر EventStorming
2. سرنخهایی برای شناسایی Bounded Context ها
3. سرنخهایی برای شناسایی Aggregate ها
ایدهی Event Sourcing را میتوان یکی از بزرگترین ایدههای مطرح شده در جامعهی DDD دانست که طی چند سال اخیر محبوبیت روز افزونی داشته است. اما آیا واقعا Event Sourcing ایدهی جدیدی است؟ با بررسی Domain های بالغ، در مییابیم که انسان از دیرباز برای فعالیت در اکثر آنها، از روش نگهداری وقایع استفاده میکرده است. این موضوع تصادفی نیست و مزایای زیادی در استفاده از Event Sourcing وجود دارد. همچنان که مانند تمام تکنیکهای دیگر، استفاده از آن بدون چالش نخواهد بود.
در این ارائه هادی احمدی به بررسی Event Sourcing، مزایا و چالشهای استفاده از آن در مدل کردن یک سیستم نرمافزاری میپردازد.
مباحث بسیاری در خصوص Bounded Context (BC) ها در سالهای اخیر طرح شده و از این ایده به فراوانی در طراحی استراتژیک محصول بهره گرفته شده است. همراه با ایده BC، چالش جدیدی در تطابق مرزهای فنی با مرزهای سازمانی به وجود آمده است و حالا هنر تعیین مرزها و شفاف سازی ابهامات برای طراحان و معماران به دارایی ارزشمندی تبدیل شده است. علیرضا خلیلی در این ارایه به شرح نکاتی میپردازد که به کشف مرز BC ها کمک میکند.
In this presentation, Ruhollah Delpak deals with the genealogy of a Legacy systems and after describing the three levels of refactoring, explains which types of refactoring has most value from DDD perspective.
He goes to explain how a deeper understanding of the problem space, can results to a useful repercussion and deeper insight and save a system from failure.
«مسعود بهرامی» نشان داد چگونه میتوان جلسات مدلسازی را که بیشتر اوقات جلساتی خستهکننده، کمبازده و طولانی مدت هستند، به کمک تکنیک #EventStorming به جلساتی مفید و کوتاه تبدیل کرد و به مدلی رسید که نه تنها توسعهدهندگان بلکه همهی ذینفعان محصول در خلق آن مشارکت دارند.
هادی احمدی در این سخنرانی به اشتباهات رایج در یکپارچهسازی #BC (#BoundedContext) ها و عواملی که باعث وابستگی BC ها به یکدیگر و از بین رفتن استقلال آنها می شود، میپردازد.
در این سخنرانی
@sepnamdar
برای مخاطبان توضیح میدهد که #UbiquitousLanguage و #BDD چگونه در کنار هم زندگی میکنند و میتوانند نیرو محرکهی یکدیگر باشند.
در بخش دیگری از این ارایه، او با نشان دادن نمونه کد و ذکر مثال، کوشید تا مخاطب درک ملموسی از BDD پیدا کند.
روح الله دلپاک در این ارایه به شرح این نکته پرداخت که پیچیدگی نهفته در «زبان» و به ویژه «زبان فارسی» چگونه میتواند باعث شود تا فهم مساله با مشکل مواجه شود. همچنین او به شرح آفتهای ناشی از ترجمه میپردازد و پیشنهاد میکند که برای حفظ زبان فراگیر بهتر است تا از ترجمه اجتناب شود.
More from Iranian Domain-Driven Design Community (10)
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In this slide, we show the simulation example and the way to compile this solver.
In this solver, the Helmholtz equation can be solved by helmholtzFoam. Also, the Helmholtz equation with uniformly dispersed bubbles can be simulated by helmholtzBubbleFoam.
Strategies for Successful Data Migration Tools.pptxvarshanayak241
Data migration is a complex but essential task for organizations aiming to modernize their IT infrastructure and leverage new technologies. By understanding common challenges and implementing these strategies, businesses can achieve a successful migration with minimal disruption. Data Migration Tool like Ask On Data play a pivotal role in this journey, offering features that streamline the process, ensure data integrity, and maintain security. With the right approach and tools, organizations can turn the challenge of data migration into an opportunity for growth and innovation.
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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!
Your Digital Assistant.
Making complex approach simple. Straightforward process saves time. No more waiting to connect with people that matter to you. Safety first is not a cliché - Securely protect information in cloud storage to prevent any third party from accessing data.
Would you rather make your visitors feel burdened by making them wait? Or choose VizMan for a stress-free experience? VizMan is an automated visitor management system that works for any industries not limited to factories, societies, government institutes, and warehouses. A new age contactless way of logging information of visitors, employees, packages, and vehicles. VizMan is a digital logbook so it deters unnecessary use of paper or space since there is no requirement of bundles of registers that is left to collect dust in a corner of a room. Visitor’s essential details, helps in scheduling meetings for visitors and employees, and assists in supervising the attendance of the employees. With VizMan, visitors don’t need to wait for hours in long queues. VizMan handles visitors with the value they deserve because we know time is important to you.
Feasible Features
One Subscription, Four Modules – Admin, Employee, Receptionist, and Gatekeeper ensures confidentiality and prevents data from being manipulated
User Friendly – can be easily used on Android, iOS, and Web Interface
Multiple Accessibility – Log in through any device from any place at any time
One app for all industries – a Visitor Management System that works for any organisation.
Stress-free Sign-up
Visitor is registered and checked-in by the Receptionist
Host gets a notification, where they opt to Approve the meeting
Host notifies the Receptionist of the end of the meeting
Visitor is checked-out by the Receptionist
Host enters notes and remarks of the meeting
Customizable Components
Scheduling Meetings – Host can invite visitors for meetings and also approve, reject and reschedule meetings
Single/Bulk invites – Invitations can be sent individually to a visitor or collectively to many visitors
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Courier Management – Keeps a check on deliveries like commodities being delivered in and out of establishments
Alerts & Notifications – Get notified on SMS, email, and application
Parking Management – Manage availability of parking space
Individual log-in – Every user has their own log-in id
Visitor/Meeting Analytics – Evaluate notes and remarks of the meeting stored in the system
Visitor Management System is a secure and user friendly database manager that records, filters, tracks the visitors to your organization.
"Secure Your Premises with VizMan (VMS) – Get It Now"
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Come join this talk to see some tips and tricks for using Quarkus and some of the lesser known features, extensions and development techniques.
Software Engineering, Software Consulting, Tech Lead.
Spring Boot, Spring Cloud, Spring Core, Spring JDBC, Spring Security,
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Games are powerful teaching tools, fostering hands-on engagement and fun. But they require careful consideration to succeed. Join me to explore factors in running and selecting games, ensuring they serve as effective teaching tools. Learn to maintain focus on learning objectives while playing, and how to measure the ROI of gaming in education. Discover strategies for pitching gaming to leadership. This session offers insights, tips, and examples for coaches, team leads, and enterprise leaders seeking to teach from simple to complex concepts.
In software engineering, the right architecture is essential for robust, scalable platforms. Wix has undergone a pivotal shift from event sourcing to a CRUD-based model for its microservices. This talk will chart the course of this pivotal journey.
Event sourcing, which records state changes as immutable events, provided robust auditing and "time travel" debugging for Wix Stores' microservices. Despite its benefits, the complexity it introduced in state management slowed development. Wix responded by adopting a simpler, unified CRUD model. This talk will explore the challenges of event sourcing and the advantages of Wix's new "CRUD on steroids" approach, which streamlines API integration and domain event management while preserving data integrity and system resilience.
Participants will gain valuable insights into Wix's strategies for ensuring atomicity in database updates and event production, as well as caching, materialization, and performance optimization techniques within a distributed system.
Join us to discover how Wix has mastered the art of balancing simplicity and extensibility, and learn how the re-adoption of the modest CRUD has turbocharged their development velocity, resilience, and scalability in a high-growth environment.
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2. Who are you?
• Software Developer for more than 20 years
• Worked mainly for ISVs
• Reuters, SunGard, Misys, Huddle
• Worked for a couple of MIS departments
• DTI, Beazley
• Microsoft MVP for C#
• Interested in architecture and design
• Interested in Agile methodologies and practices
• No smart guys
• Just the guys in this room
2
9. I call them “unit tests,” but they don't
match the accepted definition of unit tests very well
Kent Beck, TDD By Example
10. To isolate issues that may arise, each test case should be
tested independently. Substitutes such as method stubs,
mock objects, fakes, and test harnesses can be used to
assist testing a module in isolation.
https://en.wikipedia.org/wiki/Unit_testing
11. Need-driven Development [is a] variation on the test-driven
development process where code is written from the outside in
and all depended-on code is replaced by Mock Objects that verify
the expected indirect outputs of the code being written.
Meszaros, Gerard. xUnit Test Patterns
12. Our need for Inversion of Control containers, over Poor
Man’s DI is due to Need-Driven Development
13. When I look around now, I see a lot of people using mocks to
replace all their dependencies. My concern is that they will
begin to hit the Fragile Test issues that mocks present. Gerard
Meszaros identifies the issues we hit as two specific smells:
Overspecified Software and Behavior Sensitivity.
http://codebetter.com/iancooper/2007/12/19/mocks-and-the-dangers-of-overspecified-software/
15. Refactoring (noun): a change made to the internal structure
of software to make it easier to understand and cheaper to
modify without changing its observable behavior.
https://martinfowler.com/bliki/DefinitionOfRefactoring.html
16. If the program’s behavior is stable from an observer’s
perspective, no tests should change.
https://medium.com/@kentbeck_7670/programmer-test-principles-d01c064d7934
17. My personal style is I just don’t go very far down the mock
path… your test is completely coupled to the
implementation not the interface… of course you can’t
change anything without breaking the tests
Kent Beck https://www.youtube.com/watch?v=z9quxZsLcfo
18. Failure of a Unit Test shall implicate one (1) and only one (1)
unit. (A method, class, module, or package.)
Failure of a Programmer Test, under Test Driven
Development, implicates only the most recent edit.
https://wiki.c2.com/?ProgrammerTest
https://wiki.c2.com/?DeveloperTest
19. Test Driven Development produces Developer Tests. The
failure of a test case implicates only the developer's most
recent edit. This implies that developers don't need to use
Mock Objects to split all their code up into testable units.
And it implies a developer may always avoid debugging by
reverting that last edit.
https://wiki.c2.com/?UnitTest
20. How should the running of tests affect one another? Not at all.
Kent Beck, TDD By Example
21. Avoid using mocks for anything other than issues with:
• Isolated Test
• Fast Test
• Fragile Test
23. Originally called Functional Tests because each acceptance
test tries to test the functionality of a user story.
Acceptance tests are different [is] modeled and possibly
even written by the customer. ...Hence the even-newer
name, Customer Test.
https://wiki.c2.com/?AcceptanceTest
24. These two problems--that customers don't participate, which
eliminates the purpose of acceptance testing, and that they
create a significant maintenance burden, means that acceptance
testing isn't worth the cost. I no longer use it or recommend it.
James Shore, http://www.jamesshore.com/Blog/The-Problems-With-Acceptance-Testing.html
25. Customers illustrate their descriptions with concrete
examples…programmers use these examples to guide their
work…Sometimes [programmers] use the examples directly in their
tests…More often…programmers use the examples as a guide,
writing a multitude of more focused, programmer-centric tests as
they use TDD
https://www.jamesshore.com/v2/blog/2010/alternatives-to-acceptance-testing
26. TDD should create tests that can be read, so that others can
understand the requirements
27. ATDD is perilous because it implies that TDD does not deal with the
acceptance criteria for stories
30. We need to be able to add amounts in
two different currencies and convert the
result given a set of exchange rates.
Kent Beck, TDD By Example
31. The next test you write in TDD is just the most
obvious step that you can make towards
implementing the requirement given by a use case
or user story.
32. I found the shift from thinking in tests to thinking in
behaviour so profound that I started to refer to TDD as
BDD, or behaviour- driven development.
https://dannorth.net/introducing-bdd/
33. 4: It doesn’t matter if you are test first or test last
34. You need a way to think about design, you need a
method for scope control
Kent Beck, TDD By Example
35. When we write a test, we imagine the perfect interface for
our operation. We are telling ourselves a story about how
the operation will look from the outside.
Kent Beck, TDD By Example
36. If you are struggling to write a test, because the
acceptance criteria for the story are not clear – TDD is
working
37. One of the hardest things to communicate about
test-driven development is the mental state that it
puts you in.
Martin Fowler in Kent Beck, TDD By Example
39. If we test first, we don’t end up with speculative code.
40. We should not introduce new paths in refactoring, we
need a new test.
41. But not all of our code should be driven by TDD
42. Don’t drive visual output
Don’t drive a spike or other throwaway code
Don’t drive 3rd party code
Don’t drive integration
43. TDD is for fast binary feedback.
It works best where we can develop in short cycles.
If the feedback is not quick, consider another method to confirm
This is where we use a test double
48. 1: Developers write Unit Tests
2: Customers write Acceptance Tests
3: The trigger for a new test is a new function
4: It doesn’t matter if you are test first or test last
5: You want 100% test coverage of your code
6: TDD is sufficient
50. Red-Green-Refactor
1 Red Write a little test that doesn't work, and perhaps
doesn't even compile at first.
2.Green Make the test work quickly, committing
whatever sins necessary in the process.
3.Refactor Eliminate all of the duplication
created in merely getting the test to work.
51. Write a test.
Remove duplication.
Make it compile.
Run it to see that it fails.
Make it run.
52. Make it run. Quickly getting that bar to go to green
dominates everything else.
This shift in aesthetics is hard for some experienced
software engineers.
This is not just about accepting sin, its about
being sinful
Write sinful code!
53. We can commit any number of sins to get there,
because speed trumps design, just for that brief
moment.
Kent Beck, TDD by Example
54. Good design at good times. Make it run, make it
right.
Kent Beck, TDD by Example
55. The Refactoring Step is when we produce clean code.
It’s when you apply patterns [Kerievsky].
It’s when you remove duplication [Beck]
It’s when you sanitize the code smells. [Fowler]
56. Pattern Test Writing Refactoring
Command X
Value Object X
Null Object X
Template Method X
Pluggable Object X
Pluggable Selector X
Factory Method X X
Imposter X X
Composite X X
Collecting Parameter X X
Kent Beck, TDD By Example
57. You do not write new unit tests when refactoring to
clean code.
You are not introducing public classes.
It is likely if you feel the need to introduce a new public class, you
may need collaborators that fulfill a role.
67. 1:Respond to behaviour changes
2: Not respond to structure changes
3: Should be Fast
4: Should not be fragile
5: Cheap to write
6: Easy to read
7: Easy to change
https://medium.com/@kentbeck_7670/programmer-test-principles-d01c064d7934