Learn Test Driven Development
Learn Test Driven Development
English Edition
About the Book
Book to help to learn TDD, with several proposals of sequenced katas to address several details of the methodology. Katas are organized in formulation, resolution examples and a complete explanation of the main point illustrated with the exercise.
License
This book is a translation into English of Aprende Test Driven Development which was originally written in Español.
About the Authors
Table of Contents
-
Prologue
-
- How to use this book
- Disclaimer
-
-
Basic TDD concepts
-
What is TDD and why should I care about it?
- The Test Driven Development methodology
- What is not Test Driven Development
- Benefits
- References
-
Basic concepts
- Test
- Types of tests
- Test Case
- Test Suite
- Production code
- Software unit
- Subject under test
- Refactoring
-
Coding-dojo y katas
- Kata
- Coding-dojo
- Advice for completing the kata individually
- How to introduce TDD in development teams
- Kata repositories
- References
-
What is TDD and why should I care about it?
-
Classic TDD
-
The laws of TDD
- The laws in detail
- The second test and the three laws
- Violations of the three laws and their consequences
- What does it mean if a test passes just after writing it?
- The red-green-refactor cycle
- References
-
Fizz Buzz
- Understanding the laws and cycles of TDD
- History
- Problem statement
- Hints to solve it
- Links of interest about the FizzBuzz kata
-
Solving the Fizz Buzz kata
- Statement of the kata
- Language and focus
- Define the class
-
Define the
generatemethod -
Define a behavior for
generate - Generate a list of numbers
- We keep generating numbers
- The test that doesn’t fail
- Learning to say “Fizz”
- Saying “Fizz” at the right time
- Learning to say “Buzz”
- Saying “Buzz” at the right time
- Learning to say “FizzBuzz”
- Saying “FizzBuzz” at the right time
- Wrapping up
- What have we learned in this kata
-
Selection of examples and finalization criteria
- Checklist driven testing
- Example selection
- Using many examples to generalize an algorithm
- In search of the wrong abstraction
- The correct abstraction
-
Evolution of the behavior through tests
- Constructing the public interface of a test driven class
- Drive the development of a behavior through examples
- References
-
Prime Factors
- Introduction
- History
- Problem statement
- Hints to solve it
- Links of interest about the Prime Factors kata
-
Solving the Prime Factors kaka
- Statement of the kata
- Language and approach
- Define the function
- Define the function’s signature
- Obtaining more imformation about the problem
- Introducing a test that doesn’t fail
- Questioning our algorithm
- Discovering the multiples of 2
- Introducing more factors
- New divisors
- The shortest path isn’t always the fastest
- Introducing new factors, second try
- More than two factors
- Do we have any criteria to select new examples?
- What have we learned in this kata
-
The choice of the first test
- In search of the simplest test that can fail
- The happiness of the paths
-
NIF
- Start with the sad paths and postpone the solutions
- History
- Problem statement
- Hints to solve it
- Links of interest about the kata
-
Solving the NIF kata
- Statement of the kata
- Language and focus
- Create the constructor function
- Implement the first validation
- A test to rule them all
- Complete the validation of the length and start examining the structure
- The not very clean way of changing the test and production code a the same time
-
Unify the
stringlength validation - Moving forward with the structure
- Invert the conditional
- The end of the structure
- Compacting the algorithm
- Finishing the structural validation
- Compacting the validation
- Let’s look on the bright side
- Changing the public interface
- NOW it’s time
- Moving forward with the algorithm
- More refactoring
- Validating more control letters
- A refactoring, for even more simplicity
- NIE support
- What have we learned in this kata
- References
-
The refactoring phase
- The function of refactoring in TDD
- Which refactorings to do
- Refactoring limits
- When is the right moment to refactor
-
Bowling game
- The refactoring phase
- History
- Problem statement
- Hints to solve it
- Links of interest about the Bowling Game kata
-
Solving the Bowling Game kata
- Statement of the kata
- Language and approach
- Starting the game
- Let’s throw the ball
- Time to refactor
- Counting the points
- The world’s worst thrower
- Organizing the code
- Teaching our game to count
- A step back to reach further
- Recovering a cancelled test
- Getting more comfortable
- How to handle a spare
- Introducing the concept of frame
- Continue handling spare
- Removing magic numbers and other refactorings
- Strike!
- Reorganizing the game knowledge
- The world’s best player
- What have we learned in this kata
-
Greetings
- A functional kata to rule them all
- History
- Problem statement
- Hints to solve it
- Links of interest about the Greetings kata
-
Solving the Greetings kata
- Statement of the kata
- Language and approach
- Basic greeting
- Generic greeting
- Use the parameter
- Back to the generic greeting
- Answering with a yell
- Be able to greet two people
- Getting ready for several names
- A refactoring before proceeding
- Reintroducing a test
- Handle an indeterminate amount of numbers
- Shout to the shouters, but only to them
- Separate names that contain commas
- Escaping commas
- What have we learned in this kata
-
The laws of TDD
-
Outside-in TDD
-
TDD approaches
- Classic TDD or Detroit School
- Outside-in, London School or mockist
- Behavior Driven Development
- So, what approach should we follow? And how do we learn TDD under the light of these approaches?
- References
-
To-do list project
- Design
-
Mockist outside-in
- Development
- Designing the acceptance test
- First unit test
- Back to the acceptance cycle
- New visit to the acceptance test
- Finishing the first user story
- Last steps
- What have we learned in this kata
-
Classic outside-in TDD
- Posing the problem
- Extraction of the use case
- Implementing a repository
- Obtaining the to-do list
- Mark a task as completed
- What have we learned in this kata
-
TDD approaches
-
TDD in real life
-
Task list, outside-in TDD sliced in user stories
- Adding task to a list
- Designing in red
- Returning to the acceptance test
- New cycle
- See the tasks on the list
- Checking completed tasks
- Next steps
-
Fixing bugs with TDD
- To-do list bugs
- Invalid payload
- Invalid business values
- Guaranteeing business rules
- Not found tasks
- Solving defects
-
Adding new features
- New user story
- Complete the story
-
Task list, outside-in TDD sliced in user stories
-
Epilogue
-
TDD and quality of life (yours)
- Knowledge in the world, knowledge in the head
- The capacity of our working memory
- A day in the life
- A final piece of advice
-
TDD and quality of life (yours)
- Notes
The Leanpub 60-day 100% Happiness Guarantee
Within 60 days of purchase you can get a 100% refund on any Leanpub purchase, in two clicks.
See full terms
80% Royalties. Earn $16 on a $20 book.
We pay 80% royalties. That's not a typo: you earn $16 on a $20 sale. If we sell 5000 non-refunded copies of your book or course for $20, you'll earn $80,000.
(Yes, some authors have already earned much more than that on Leanpub.)
In fact, authors have earned$12,307,240writing, publishing and selling on Leanpub.
Learn more about writing on Leanpub
Free Updates. DRM Free.
If you buy a Leanpub book, you get free updates for as long as the author updates the book! Many authors use Leanpub to publish their books in-progress, while they are writing them. All readers get free updates, regardless of when they bought the book or how much they paid (including free).
Most Leanpub books are available in PDF (for computers) and EPUB (for phones, tablets and Kindle). The formats that a book includes are shown at the top right corner of this page.
Finally, Leanpub books don't have any DRM copy-protection nonsense, so you can easily read them on any supported device.
Learn more about Leanpub's ebook formats and where to read them
Top Books
- #1
OpenIntro Statistics
David Diez, Christopher Barr, Mine Cetinkaya-Rundel, and OpenIntroA complete foundation for Statistics, also serving as a foundation for Data Science.
Leanpub revenue supports OpenIntro (US-based nonprofit) so we can provide free desk copies to teachers interested in using OpenIntro Statistics in the classroom and expand the project to support free textbooks in other subjects.
More resources: openintro.org.
- #2
Personal Finance
Jason AndersonThis textbook provides an in-depth analysis on personal finance that is both practical and straightforward in its approach. It has been written in such a way that the readers can gain knowledge without getting overwhelmed by the technical terms. Suitable for both beginners and advanced learners.
- #3
Getting to Know IntelliJ IDEA
Trisha Gee and Helen ScottIf we treat our IDE as a text editor, we are doing ourselves a disservice. Using a combination of tutorials and a questions-and-answers approach, Getting to Know IntelliJ IDEA will help you find ways to use IntelliJ IDEA that enable you to work comfortably and productively as a professional developer.
- #4
R Programming for Data Science
Roger D. PengThis book brings the fundamentals of R programming to you, using the same material developed as part of the industry-leading Johns Hopkins Data Science Specialization. The skills taught in this book will lay the foundation for you to begin your journey learning data science. Printed copies of this book are available through Lulu.
- #5
C++20 - The Complete Guide
Nicolai M. JosuttisAll new language and library features of C++20 (for those who know previous C++ versions).
The book presents all new language and library features of C++20. Learn how this impacts day-to-day programming, to benefit in practice, to combine new features, and to avoid all new traps.
Buy early, pay less, free updates.
Other books:
- #6
Mastering STM32 - Second Edition
Carmine NovielloWith more than 1200 microcontrollers, STM32 is probably the most complete ARM Cortex-M platform on the market. This book aims to be the most complete guide around introducing the reader to this exciting MCU portfolio from ST Microelectronics and its official CubeHAL and STM32CubeIDE development environment.
- #7
Stats One
William Foote - #8
Machine Learning Q and AI
Sebastian Raschka, PhDHave you recently completed a machine learning or deep learning course and wondered what to learn next? With 30 questions and answers on key concepts in machine learning and AI, this book provides bite-sized bits of knowledge for your journey to becoming a machine learning expert.
- #9
Ansible for DevOps
Jeff GeerlingAnsible is a simple, but powerful, server and configuration management tool. Learn to use Ansible effectively, whether you manage one server—or thousands.
- #10
Gradual Modularization for Ruby and Rails
Stephan HagemannGet yourself a new tool to manage your Rails application and your growing engineering organization! Prevent the ball-of-mud (and fix it!). Go for microservices or SOA if it makes sense not just because you don't have any other tool. Do all this through a low-overhead tool: packages. Enable better conversations to make practical changes today.
Top Bundles
- #1
Software Architecture
2 Books
"Software Architecture for Developers" is a practical and pragmatic guide to modern, lightweight software architecture, specifically aimed at developers. You'll learn:The essence of software architecture.Why the software architecture role should include coding, coaching and collaboration.The things that you really need to think about before... - #2
CCIE Service Provider Ultimate Study Bundle
2 Books
Piotr Jablonski, Lukasz Bromirski, and Nick Russo have joined forces to deliver the only CCIE Service Provider training resource you'll ever need. This bundle contains a detailed and challenging collection of workbook labs, plus an extensively detailed technical reference guide. All of us have earned the CCIE Service Provider certification... - #3
1500 QUIZ COMMENTATI (3 libri)
3 Books
Tre libri dei QUIZ MMG Commentati al prezzo di DUE! I QUIZ dei concorsi ufficiali di Medicina Generale relativi agli anni: 2000-2001-2003-2012-2013-2014-2015-2016-2017-2018-2019-2020-2021 +100 inediti Raccolti in unico bundle per aiutarvi nello studio e nella preparazione al concorso. All'interno di ogni libro i quiz sono stati suddivisi per... - #4
Pattern-Oriented Memory Forensics and Malware Detection
2 Books
This training bundle for security engineers and researchers, malware and memory forensics analysts includes two accelerated training courses for Windows memory dump analysis using WinDbg. It is also useful for technical support and escalation engineers who analyze memory dumps from complex software environments and need to check for possible... - #5
Practical FP in Scala + Functional event-driven architecture
2 Books
Practical FP in Scala (A hands-on approach) & Functional event-driven architecture, aka FEDA, (Powered by Scala 3), together as a bundle! The content of PFP in Scala is a requirement to understand FEDA so why not take advantage of this bundle!? - #7
Linux Administration Complet
4 Books
Ce lot comprend les quatre volumes du Guide Linux Administration :Linux Administration, Volume 1, Administration fondamentale : Guide pratique de préparation aux examens de certification LPIC 1, Linux Essentials, RHCSA et LFCS. Administration fondamentale. Introduction à Linux. Le Shell. Traitement du texte. Arborescence de fichiers. Sécurité... - #9
Development and Deployment of Multiplayer Online Games, Part ARCH. Architecture (Vol. I-III)
3 Books
What's the Big Idea? The idea behind this book is to summarize the body of knowledge that already exists on multiplayer games but is not available in one single place.And quite a fewof the issues discussed within this series (planned as three nine volumes ~300 pages each), while known in the industry, have not been published at all (except for... - #10
Modern C++ Collection
3 Books
Get All about Modern C++C++ Standard Library, including C++20Concurrency with Modern C++, including C++20C++20Each book has about 200 complete code examples. Updates are included. When I update one of the books, you immediately get the updated bundle. You can expect significant updates to each new C++ standard (C++23, C++26, .. ) and also...
