Khaled El-Morabea - Modularizing Legacy Projects Using TDD: Test-Driven Development with XCTest for iOS
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- Book:Modularizing Legacy Projects Using TDD: Test-Driven Development with XCTest for iOS
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Modularizing Legacy Projects Using TDD: Test-Driven Development with XCTest for iOS: summary, description and annotation
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Youll start by reviewing the TDD Cycle and how to implement these concepts on a legacy project or a new one. Youll then walk through TDD step-by-step on a blank project, including setting up test targets, assertions, and expectations. Youll follow that with all levels of testing such as unit tests, integration tests, and end-to-end tests, and also tackle fairly complex, yet badly written legacy code.
The book will take you through the journey of modularizing a legacy app using TDD. Throughout this journey, you will be introduced to multiple testing concepts and techniques, like writing tests for network and core data layers. You will write tests to ensure the thread safety of your app. And youll add a new feature while you are in the middle of refactoring, which is an important skill so you can keep adding features while you are fixing your technical debt. By the end of this book, you will have all the tools needed to become a testing master.
What Youll Learn
- Use mocking and dependency injection to make components more testable
- Write tests for asynchronous code like network code
- Add new features to existing legacy apps using TDD
Who This Book Is For
Experienced iOS developers who care about software quality and meeting customer expectations.
Khaled El-Morabea: author's other books
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This Apress imprint is published by the registered company APress Media, LLC part of Springer Nature.
The registered company address is: 1 New York Plaza, New York, NY 10004, U.S.A.
When I started writing this book, it was in the middle of the pandemic, and we had a new arrival to our family, Noah. It was a tough period. Imagine raising a new baby during the pandemic and with all these restrictions to stay at home and you need to focus on writing your first book. So I would like to dedicate this book to my wife, Yasminawithout her help and support, it wouldnt have been possible. And to my parents, Huda and Mohamedwithout their continuous support and love, I wouldnt be where I am now.
Khaled El-Morabea
To my sister, Rana, for pushing me to take on this challenging yet fulfilling project. And to my parents, Sahar and Saleh, for their unending love and their much-needed emotional support. And to Aya, without her love and support, this book would have never seen the light of day.
Hassaan El-Garem
Any source code or other supplementary material referenced by the author in this book is available to readers on GitHub via the books product page, located at www.apress.com/978-1-4842-7427-9. For more detailed information, please visit http://www.apress.com/source-code.
We would like to thank the many people who helped us write this book. We are very grateful to Vishwesh Shrimalihis constant and thorough feedback was integral in making this book. We would also like to thank Moataz Soliman, Ahmed AbouElhamayed, Mahmoud Othman, Aprille Muscara, and Anwar El-Wakilwithout their feedback, this book wouldve been in a much worse state. We also thank Aaron Black, for believing in this project from day one. And, finally, we especially thank our editor, Jessica Vakili, who was extremely supportive throughout the whole process of writing this book.
is an engineering manager at Instabug. He has been an iOS developer for more than 8 years and leading the iOS team for more than 3 years. In that time he has worked on several projects. During his time at Instabug, he has worked on multiple integral products, both as a developer and as a strategic engineering manager.
has been involved in the field of iOS development for 5 years, during which he worked on multiple apps and projects. He has a passion for testing and for working on complex projects while maintaining the highest level of quality. Following his passion for testing has led him to create a closed-source testing framework used for randomized stress testing.
graduated in 2018 from BITS Pilani, where he studied mechanical engineering. Since then, he has worked with Big Vision LLC on deep learning and computer vision and was involved in creating official OpenCV AI courses. Currently, he is working at Mercedes-Benz Research and Development India Pvt. Ltd. He has a keen interest in programming and AI and has applied that interest in mechanical engineering projects. He has also written multiple blogs on OpenCV and deep learning on LearnOpenCV, a leading blog on computer vision. He has also coauthored Machine Learning for OpenCV 4 (Second Edition) by Packt. When he is not writing blogs or working on projects, he likes to go on long walks or play his acoustic guitar.
A developer is a craftsman, a skilled individual driven by passion. Most developers enjoy what they do for a living, to the extent that a lot of developers choose coding as their secondary hobby in their free time. They are proud of what they develop and set high quality standards for their work. Nothing feels better than releasing new code that works well and meets users expectations. The user here could be the customer or the developer who developed the code themselves. This is important to realize. This sets the intention of the developer as someone who wants to produce high-quality results.
It is no secret that everyone out there including you wants their software projects to be of the highest quality. Yet achieving such a standard isnt particularly easy, and maintaining it can be even harder. Lets say you have worked on an MVP (Minimal Viable Product) and it got released. In most cases this is not the end of the story. Youll probably keep on adding features to it. At some point youll even realize you need to rewrite a big part of your code or swipe out a dependency for another. These constant changes will eventually compromise your projects quality. Even bug fixes can make a dent at your quality. Its very common to fix one bug and have it cause another more serious bug someplace else. So how can we reach a high quality standard and maintain it? We need to have constant feedback that tells us if our changes introduce any issues. And how can we get such feedback? The answer is simple: testing.
There is more than one type of testing you can utilize to address these problems. The first solution we will discuss is manual testing. Manual testing is a type of testing in which test cases are executed manually either by a tester or directly by the developer. Manual testing in many cases is considered to be an imperative part of the software cycle. Good testers often have a knack of thinking of highly irregular scenarios, which ultimately leads to identifying hidden bugs.
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