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Test-Driven iOS Development with Swift 3

Book Description

Write testable and maintainable code to develop highly-functional iOS apps

About This Book

  • Learn test-driven principles to help you build apps with fewer bugs and better designs
  • Become more efficient while working with Swift to move on to your next project faster!
  • Implement all of the principles of test-driven development (TDD) in to your daily programming workflow

Who This Book Is For

My reader have already done some application development with Swift. They follow the changes in each new Swift version. They also follow a few Swift developers on Twitter or Tumblr and read blog post from famous Swift bloggers. My reader have already heard about Test-Driven Development (TDD) but haven't done really much about it. But they have heard/read that TDD can help to write better code but they don't really know why.

What You Will Learn

  • Implement TDD in Swift application development
  • Find bugs before you enter the code using the TDD approach
  • Use TDD to build models, view controllers, and views
  • Test network code with asynchronous tests and stubs
  • Write code that is a joy to read and to maintain
  • Develop functional tests to ensure the app works as planned
  • Employ continuous integration to make testing and deployment easier

In Detail

Test-driven development (TDD) is a proven way to find software bugs early. Writing tests before your code improves the structure and maintainability of your apps. In combination with the improved syntax of Swift 3, there is no excuse or writing bad code.

This book will help you understand the process of TDD and how it impacts your apps written in Swift. Through a practical, real-world example app, you’ll start seeing how to implement TDD in context. You will begin with an overview of the TDD workflow and then deep dive into unit testing concepts and code cycles. You will also plan and structure your test driven iOS app, and write tests to drive the development of the view controllers and the helper classes. Next, you’ll learn how to write tests for network code, what CI is and how to set it up using Xcode Server.

Finally, the book will guide you through the next steps to become a testing expert by discussing integration tests, Behavior Driven Development (BDD), open source testing frameworks and UI Tests introduced in Xcode 8.

Style and approach

Using a step-by-step approach, you will develop an entire iOS app using TDD. During the course of the book, you will experience different strategies to write tests for models, View Controller, and networking code.

Downloading the example code for this book. You can download the example code files for all Packt books you have purchased from your account at http://www.PacktPub.com. If you purchased this book elsewhere, you can visit http://www.PacktPub.com/support and register to have the code file.

Table of Contents

  1. Test-Driven iOS Development with Swift 3
    1. Test-Driven iOS Development with Swift 3
    2. Credits
    3. About the Author
    4. About the Reviewer
    5. www.PacktPub.com
      1. Why subscribe?
    6. Preface
      1. What this book covers
      2. What you need for this book
      3. Who this book is for
      4. Conventions
      5. Reader feedback
      6. Customer support
        1. Downloading the example code
        2. Downloading the color images of this book
        3. Errata
        4. Piracy
        5. Questions
    7. 1. Your First Unit Tests
      1. Building your first automatic unit test
        1. What are unit tests?
        2. Implementing a unit test example
        3. Important built-in assert functions
      2. Understanding TDD
        1. The TDD workflow - red, green, and refactor
          1. Red
          2. Green
          3. Refactor
      3. TDD in Xcode
        1. An example of TDD
          1. Red - example 1
          2. Green - example 1
          3. Refactor - example 1
          4. Red - example 2
          5. Green - example 2
          6. Refactor - example 2
          7. A recap
        2. Finding information about tests in Xcode
          1. Test Navigator
          2. Tests overview
          3. Running tests
            1. Running one specific test
            2. Running all tests in a test case
            3. Running a group of tests
          4. The setUp() and tearDown() methods
          5. Debugging tests
          6. Breakpoint that breaks on test failure
          7. The test again feature
      4. The advantages of TDD
      5. The disadvantages of TDD
      6. What to test
      7. Summary
    8. 2. Planning and Structuring Your Test-Driven iOS App
      1. The task list view
      2. The task detail view
      3. The task input view
      4. The structure of the app
        1. The Table View Controller, the delegate, and the data source
        2. Table view cells
        3. The model
        4. Other View Controllers
        5. The development strategy
      5. Getting started with Xcode
      6. Setting up useful Xcode behaviors for testing
        1. Useful build behaviors
        2. Testing behaviors
      7. Summary
    9. 3. A Test-Driven Data Model
      1. Implementing the ToDoItem struct
        1. Adding a title property
        2. Adding an itemDescription property
        3. Removing a hidden source of bugs
        4. Adding a timestamp property
        5. Adding a location property
      2. Implementing the Location struct
        1. Adding a coordinate property
      3. Implementing the ItemManager class
        1. Count
        2. Adding and checking items
        3. Equatable
        4. Removing all items
        5. Ensuring uniqueness
      4. Summary
    10. 4. A Test-Driven View Controller
      1. Implementing ItemListViewController
      2. Implementing ItemListDataProvider
        1. Conducting the first tests
        2. Fake objects
        3. Using mocks
        4. Checking and unchecking items
        5. Implementing ItemCell
      3. Implementing DetailViewController
      4. Implementing InputViewController
      5. Summary
    11. 5. Testing Network Code
      1. Implementing tests using a web service
      2. Implementing a login request
      3. Handling errors
      4. Summary
    12. 6. Putting It All Together
      1. Connecting parts
        1. The initial View Controller
        2. Showing the input view
        3. Showing the detail view
      2. Serialization and deserialization
      3. Functional tests
        1. Adding a UI test target
        2. Recording and testing
      4. Summary
    13. 7. Code Coverage and Continuous Integration
      1. Enabling code coverage
        1. Code coverage in Xcode
        2. What code coverage is enough?
      2. Continuous integration
        1. Installing and setting up Xcode Server
        2. Adding bots
      3. Automatic deployment with fastlane
        1. Installing fastlane
        2. Setting up
      4. Summary
    14. 8. Where to Go from Here
      1. What we have learned so far
      2. Integration tests
      3. UI tests
      4. Behavior-Driven Development
      5. TDD in existing projects
      6. More information about TDD
      7. Summary