[ Free Book ] ♛ Growing Object-Oriented Software, Guided by Tests (Beck Signature Series) ♫ MOBI eBook or Kindle ePUB free

A great read for anyone interested in automated testing and TDD Pros Makes a strong case for testing better design, faster feedback, user experience first, regression, and most importantly, the confidence to make changes quickly Includes a nice walk through of an iterative, test driven development process of a small app Lots of great examples of how listening to tests leads to better design ie, what the driven really means in TDD I learned a lot from the discussion of how to make tests readable and maintainable Cons The book is 100% Java How do these lessons apply to other OO languages The authors spend too much time selling the jMock framework The app they develop iteratively is a Java swing app full of distracting details like the way Swing manages threads It was a bit boring at times and the code was verbose, so it was easy to lose focus Fun quotes What if software wasn t made, like we make a paper airplane finish folding it and fly it away What if, instead, we treated software like a valuable, productive plant, to be nurtured, pruned, harvested, fertilized, and watered Traditional farmers know how to keep plants productive for decades or even centuries How would software development be different if we treated our programs the same way As John Gall wrote in Gall03 , A complex system that works is invariably found to have evolved from a simple system that works In our work, we apply feedback cycles at every level of development, organizing projects as a system of nested loops ranging from seconds to months, such as pair programming, unit tests, acceptance tests, daily meetings, iterations, releases, and so on Each loop exposes the team s output to empirical feedback so that the team can discover and correct any errors or misconceptions.One lesson that we ve learned repeatedly is that nothing forces us to understand a process better than trying to automate it Our experience is that, when code is difficult to test, the most likely cause is that our design needs improving The same structure that makes the code difficult to test now will make it difficult to change in the future.When composing objects into a new type, we want the new type to exhibit simpler behavior than all of its component parts considered together The composite object s API must hide the existence of its component parts and the interactions between them, and expose a simpler abstraction to its peers.In most systems we build, we end up writing a runtime exception called something like Defect or perhaps StupidProgrammerMistakeException We throw this when the code reaches a condition that could only be caused by a programming error, rather than a failure in the runtime environment.By repeatedly fixing local problems in the code, we find we can explore the design safely, never straying than a few minutes from working code Usually this is enough to lead us towards a better design, and we can always backtrack and take another path if it doesn t work out One way to think of this is the rock climbing rule of three point contact Trained climbers only move one limb at a time a hand or a foot , to minimize the risk of falling off Each move is minimal and safe, but combining enough of them will get you to the top of the route. I didn t know what to expect when I picked up this book In spite of its excellent reviews I feared it was going to be another redundant addition to the mountain of books harping on the virtues of Test Driven Development TDD , without adding anything significant to the standard sermon.Nothing could be further from the truth.I read a fair share of technical books, but this book is the only one in years that I immediately began to re read again after finishing It is easily one of the most important books on software engineering out there, and is likely to remain so for some time to come.The authors present what is now known as the London school of TDD, where the correctness of an object is defined by its interactions with its collaborators, not necessarily by its state Although I had seen mocking frameworks in action before, never had I seen one being used throughout the development of a software project.Another fascinating idea is the notion of writing an end to end test first, before even starting to write unit tests We have been so thoroughly drilled on the virtues of fast tests, that it doesn t occur to us any that it s even possible even preferable to exercice the whole system, perhaps in a separate test suite.But the best part of the book is the sample project used to illuminate these concepts It consists in writing a desktop application with which a user can automate the process of bidding in online auctions The graphical part is done with the Swing framework in Java, and the application talks via XMPP to the auction house The first chapter in the case study is about setting up literally an end to end test, i.e a test written with JUnit that will verify if the graphical display matches the XMPP communications.From there on, the case study proceeds with the implementation of feature after feature, always following the same pattern write the end to end test first, implement the feature with TDD, refactor, repeat.No book is worth reading if it doesn t change your approach to your existing projects This one showed me immediately where our current project an embedded system for energy management was lacking in terms of testing.Go read this book, and send me flowers and chocolates. I think there s a lot of food for thought in this book Personally, I can remember reading Martin Fowler s Mocks Aren t Stubs some time ago and concluding that I d be a classicist Some time later, I started working with mocks as a way to isolate unit tests from slow dependencies, such as databases, trying to make them run quickly I didn t have much success, though, because I was still writing my tests in a classicist style.This book helped open my eyes to how the mockist style really works, and why it can be a good thing I absolutely recommend it to any programmer who is doing TDD or writing unit tests , but who still feels like when it comes to being a mockist, they just don t get it.I also think a great complement to the book is the video of J B Rainsberger s presentation Integration Tests Are A Scam.As a note on how to read the book, I got a bit bogged down in the middle section, with the worked example I ended up skipping to the final section and came back to the middle after Reading it like that worked just fine I also think it could be interesting to alternate chapters of the middle section with those of the final section. One of best books about software design and TDD and tests in general. [ Free Book ] ♜ Growing Object-Oriented Software, Guided by Tests (Beck Signature Series) ⚕ Foreword By Kent BeckThe Authors Of This Book Have Led A Revolution In The Craft Of Programming By Controlling The Environment In Which Software GrowsWard CunninghamAt Last, A Book Suffused With Code That Exposes The Deep Symbiosis Between TDD And OOD This One S A KeeperRobert C MartinIf You Want To Be An Expert In The State Of The Art In TDD, You Need To Understand The Ideas In This Book Michael Feathers Test Driven Development TDD Is Now An Established Technique For Delivering Better Software Faster TDD Is Based On A Simple Idea Write Tests For Your Code Before You Write The Code Itself However, This Simple Idea Takes Skill And Judgment To Do Well Now There S A Practical Guide To TDD That Takes You Beyond The Basic Concepts Drawing On A Decade Of Experience Building Real World Systems, Two TDD Pioneers Show How To Let Tests Guide Your Development And Grow Software That Is Coherent, Reliable, And Maintainable Steve Freeman And Nat Pryce Describe The Processes They Use, The Design Principles They Strive To Achieve, And Some Of The Tools That Help Them Get The Job Done Through An Extended Worked Example, You Ll Learn How TDD Works At Multiple Levels, Using Tests To Drive The Features And The Object Oriented Structure Of The Code, And Using Mock Objects To Discover And Then Describe Relationships Between Objects Along The Way, The Book Systematically Addresses Challenges That Development Teams Encounter With TDD From Integrating TDD Into Your Processes To Testing Your Most Difficult Features Coverage Includes Implementing TDD Effectively Getting Started, And Maintaining Your Momentum Throughout The Project Creating Cleaner, Expressive, Sustainable Code Using Tests To Stay Relentlessly Focused On Sustaining Quality Understanding How TDD, Mock Objects, And Object Oriented Design Come Together In The Context Of A Real Software Development Project Using Mock Objects To Guide Object Oriented Designs Succeeding Where TDD Is Difficult Managing Complex Test Data, And Testing Persistence And Concurrency A definite must read for professional developers, this book taught me a lot about incrementally building software that s constantly deployable and maintainable not only the technical know how required to do it, but also the mentality needed Reading the book made me realize that my unit testing skills are woefully lacking in comparison, so I m grateful that it provides extension tips, tricks, and examples that I can study for improvement But this book covers much than unit testing, which is why I plan on referring back to it quite often, as it has forced me to completely reconsider how I approach building software. A must read for anyone willing to learn and understand how to write concise and maintainable tests, and how to grow a code base in an object oriented fashion The techniques and principles shown in this book are pure gold walking skeleton, depth of testing, async code testing, data test builders, mocking, single responsibility, only mock classes you own, hexagonal architecture, etc If you re still in the fence about the advantages of TDD, this is for you It displays how quick it is to add new features and make changes with the confidence that you aren t breaking other parts of the system.However, the only reason I won t rate it a 5 star is that this book study case, which is great if you persevere through its setup and try it out yourself, takes time to understand the techniques they are using If you try the code it won t compile sometimes, there will be missing code and setting up the server is tricky you can checkout my GitHub project which have a README to help you out on this Nevertheless, I must say that writing it myself helped a lot It s way easier to understand the project navigating the code through an IDE than a book.To sum up, this is an amazing book for the beginner and the experienced It may take some time and TDD experience to swallow it, but it s totally worth it. OK so now I understand why this book became so popular It s that kind of book that I feel I should reread immediately after finishing it The part with the worked example is great, but personally I found specially interesting the chapters with insights about OOP design and sustainable TDD.The ideal way to get all the value of this book is to write yourself the worked code as they are doing it If you don t do it, at least take a look to the code here be honest, I didn t grab everything they explain And after finishing, the imposter syndrome is devastating me I think I know nothing 0o But it was definitely worthy and I m sure it has helped me to become a better developer I did not realize how much I still have to learn about writing good object oriented OO code, and about hewing to a tight test driven development TDD methodology, before I read Growing Object Oriented Software, Guided By Tests My education in OO and unit testing has been largely theoretical, with no time spent directly learning from experienced OO programmers my best mentor was a COBOL coder Books like Design Patterns Elements of Reusable Object Oriented Software, Patterns of Enterprise Application Architecture, Applying UML and Patterns An Introduction to Object Oriented Analysis and Design and Iterative Development, Xunit Test Patterns Refactoring Test Code, and others are wonderful but have few detailed real world business case examples.That said, I admit that I skimmed through some of the middle chapters where the application was being built it was simple to skip the details of Java implementation and focus on the points where a decision was being made, based on tests, about where to put move a piece code The authors did well in steering away from anything too Java centric, that the book would remain accessible to those of us who are not deep in that language.There is no need for me to recount the contents perusal of the table of contents should be sufficient Some of the advice about testing overlaps that found in XUnit Test Patterns, but the overlaps is small enough to warrant reading both Naturally, some of the advice will reinforce what any good and self reflective programmer will have already figured out about writing tests In that case you receive validation and further justification And much of the advice on OO programming can be found in detail in other works, though here it is uniquely combined with TDD to shed new light on the advantages of OO.A few particular highlights for meLet necessity drive design, rather week long UML sessions Write to interfaces, initially ignoring implementation Interfaces should name and describe relationships between classes Deploy as early as possible Do so even before the application does anything, just to prove that the framework can be deployed Readability applies to test code as well I already believed that, but this presentation will help me explain that better to doubters Test names can be extremely descriptive prior post I have been over reliant on Microsoft s Moles prior post Nejlep kniha o testov n Unit testy, Integra n testy, Akcepta n testy , kterou jsem etl Auto i praktici precizn popisuj sv j p stup k v voji a testov n aplikac a nevyh baj se na konci knihy ani doporu en m, jak ps t slo it j testy, kter zohled uj existenci v ce nez visl ch thread v aplikaci, nebo jak si poradit s testy, kter testuj metody z visl na aktu ln m datu a ase, a nechyb ani p klady test , kter mus ov it v sledek vol n asynchronn operace.Ke knize bych m l jen p r v hrad 1 Praktick p klady jsou v knih ch v dy u ite n , ale prost edn st s hutn mi v pisy k du, kter demonstruj , jak napsat a hlavn otestovat aplikaci komunikuj c s auk n m serverem, je po chv li morn P i ten t to kapitoly jsem si kal, e plat 10x zopakovat variaci na pravidlo Red Green Refactor je asi pozn vac znamen ka d ho opravdov ho agiln ho v voj e N co jako profylaktick pok i ov n zah n j c bla, kter refaktorizac sv ho st vaj c ho aplika n ho pekla py n pohrdl 2 V titulu knihy nen zm nka o tom, e v echny p klady budou v Jav a s vyu it m Java knihoven JMock P i ten p klad m ru ilo, e jsem se soust edil podv dom na to, jak n kter konstrukce v Jav a tak API Java knihoven p sob p i p m m srovn n se sou asn mi v razov mi prost edky jazyka C archaicky Dokonce bych ekl, e v n kter ch p kladech maji IMHO metody v JMocku lehkou pachu hacku.3 N kter pravidla pro psan k du v prvn sti knihy na m p sobila rozpa it nebo ne pln Nap klad rozd len spolupracuj c ch objekt na dependencies , notifications a adjustments v kontextu knihy a DI kontajner d v smysl, ale mn t eba hranice mezi dependencies a adjustments p ijdou neostr a u notifications tu m, e auto i jsou hodn z visl na notifikac ch ve specifick form Java listener.Kniha ale i p es tyto drobn v hrady za p e ten ur it stoj.