iOS Unit Testing by Example XCTest Tips and Techniques Using Swift 1st Edition by Jon Reid ISBN 1680506811 978-1680506815

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Product details:

ISBN 10: 1680506811
ISBN 13: 978-1680506815
Author: Jon Reid

Fearlessly change the design of your iOS code with solid unit tests. Use Xcode’s built-in test framework XCTest and Swift to get rapid feedback on all your code – including legacy code. Learn the tricks and techniques of testing all iOS code, especially view controllers (UIViewControllers), which are critical to iOS apps. Learn to isolate and replace dependencies in legacy code written without tests. Practice safe refactoring that makes these tests possible, and watch all your changes get verified quickly and automatically. Make even the boldest code changes with complete confidence.

Manual code and UI testing get slower the deeper your navigation hierarchy goes. It can take several taps just to reach a particular screen, never mind the actual workflow tests. Automatic unit testing offers such rapid feedback that it can change the rules of development. Bring testing to iOS development, even for legacy code. Use XCTest to write unit tests in Swift for all your code.

iOS developers typically reserve unit tests for their model classes alone. But that approach skips most of the code common to iOS apps, especially with UIViewControllers. Learn how to unit test these view controllers to expand your unit testing possibilities. Since good unit tests form the bedrock for safe refactoring, you’re empowered to make bold changes. Learn how to avoid the most common mistakes Swift programmers make with the XCTest framework. Use code coverage to find holes in your test suites. Learn how to identify hard dependencies.

Reshape the design of your code quickly, with less risk and less fear.

iOS Unit Testing by Example XCTest Tips and Techniques Using Swift 1st Table of contents:

Part I. Foundations

1. Assert Yourself

 What Are Unit Tests Anyway?

 Create a Place to Play with Tests

 Write Your First Assertion

 Add a Descriptive Message

 Avoid Conditionals in Tests

 Describe Objects upon Failure

 Test for Equality

 Test Equality with Optionals

 Fudge Equality with Doubles and Floats

 Avoid Redundant Messages

 Choose the Right Assertion

 Key Takeaways

 Activities

 What’s Next?

2. Manage Your Test Life Cycles

 Make a New Place to Play

 Start from Test Zero

 Hook Up Tests to Production Code

 Examine Console Output

 Observe Object Life Cycles to Learn the Phases of a Test

 The Wrong Way to Reduce Duplicate Test Code

 Learn How XCTest Manages Test Cases

 Use setUp() and tearDown()

 Key Takeaways

 Activities

 What’s Next?

3. Measure Code Coverage and Add Tests

 Make a New Place to Play

 Enable Code Coverage

 Examine Code Coverage Results

 Drill into a Partially Covered Line

 Add Tests for Existing Code

 Cover a Conditional

 Cover a Loop

 Cover Statements in a Sequence

 Avoid Percentage Targets, Embrace Forward Movement

 Key Takeaways

 Activities

 What’s Next?

4. Take Control of Application Launch

 Make a New Place to Play

 Observe the Default Behavior

 Learn About the Test Launch Sequence

 Bypass the Normal App Delegate

 Put Up with the Initial View Controller

 Tweak Your Testing App Delegate

 Key Takeaways

 Activities

 What’s Next?

5. Load View Controllers

 Make a New Place to Play

 Set Up a Storyboard-Based View Controller for Experiments

 Load a Storyboard-Based View Controller

 Set Up a XIB-Based View Controller for Experiments

 Load a XIB-Based View Controller

 Set Up a Code-Based View Controller for Experiments

 Load a Code-Based View Controller

 Key Takeaways

 Activities

 What’s Next?

6. Manage Difficult Dependencies

 Be Okay with Problem-Free Dependencies

 Identify Difficult Dependencies

 Create Boundaries to Isolate Dependencies

 Make a New Place to Play

 Add Backdoors to Singletons You Own

 Subclass and Override: A Legacy Code Technique

 Inject Instances Through Initializers or Properties

 Inject Closures to Make New Instances

 Key Takeaways

 Activities

 What’s Next?

Part II. iOS Testing Tips and Techniques

7. Testing Outlet Connections

 Make a New Place to Play

 Test Outlet Connections

 Check the Effectiveness of Failure Messages

 Key Takeaways

 Activities

 What’s Next?

8. Testing Button Taps (Using Actions)

 Make a Place to Play with a Button

 Test Button Taps

 Make a Test Helper for Button Taps

 Key Takeaways

 Activities

 What’s Next?

9. Testing Alerts

 Make a New Place to Play

 Add the Helper Framework to the Project

 Test Alerts Using the Alert Verifier

 Move the SUT into the Test Fixture

 Add Tests for Alert Buttons

 Key Takeaways

 Activities

 What’s Next?

10. Testing Navigation Between Screens

 Make a New Place to Play

 Set Up Code-Based Navigation

 Set Up Segue-Based Navigation

 Test Code-Based Push Navigation

 Test Code-Based Modal Presentation

 Test Segue-Based Push Navigation

 Test Segue-Based Modal Navigation

 Key Takeaways

 Activities

 What’s Next?

11. Testing UserDefaults (with Fakes)

 Make a New Place to Play

 Isolate UserDefaults with Dependency Injection

 Extract a Protocol to Support Test Doubles

 Make a Fake Object

 Test UserDefaults

 Key Takeaways

 Activities

 What’s Next?

12. Testing Network Requests (with Mocks)

 Make a New Place to Play

 Isolate URLSession with Dependency Injection

 Extract a URLSession Protocol for Test Doubles

 Make a Test Spy

 Design the Test Case

 Promote the Test Spy into a Mock Object

 Improve Mock Object Reporting

 Key Takeaways

 Activities

 What’s Next?

13. Testing Network Responses (and Closures)

 Make a New Place to Play

 Parse the Response

 Start with a Fresh Test Spy

 Design the Test Case

 Test Asynchronous Code

 Keep Asynchronous Code in Its Closure

 Test an Error Scenario

 Key Takeaways

 Activities

 What’s Next?

14. Testing Text Fields (and Delegate Methods)

 Make a Place to Play

 Test the Outlets

 Test Attributes and Wrangle UIKit Descriptions

 Test Delegate Methods

 Test Input Focus

 Key Takeaways

 Activities

 What’s Next?

15. Testing Table Views

 Make a Place to Play

 Test Table Views

 Key Takeaways

 Activities

 What’s Next?

16. Testing View Appearance (with Snapshots)

 Make a Place to Play

 Add FBSnapshotTestCase to a Test Target

 Set the Location for Reference Images

 Write a Snapshot Test

 See the Difference in a Snapshot Failure

 Manage Your Snapshot Tests

 Key Takeaways

 Activities

 What’s Next?

Part III. Using Your New Power

17. Unleash the Power of Refactoring

 What Is Refactoring?

 Lay Out the Views for Our Practice App

 Add the Code to Our Practice App

 Replace the Difficult Dependency with a Mock Object

 Write the First Tests of the Change Password View Controller

 Test the Cancel Button

 Test the Submit Button

 Test the Text Field Delegate Method

 Refactor to Break Up a Long Function

 Extract a Method with Parameters

 Clean Up a Few More Places

 Key Takeaways

 What’s Next?

18. Refactoring: Moving to MVVM

 What Is MVVM?

 Replace String Literals to Use a View Model

 Overwrite Storyboard Labels

 Respond to Changes in the View Model

 Move Logic into the View Model

 Key Takeaways

 What’s Next?

19. Refactoring: Moving to MVP

 What Is MVP?

 Set Up the MVP Types

 Extract Methods into the View Commands Protocol

 Move a Function into the Presenter

 Remove the didSet Observer

 Use Refactoring Principles to Reparent a Swift Type

 Move Several Functions to the Presenter

 Extract Password Validation into Its Own Type

 Finish Up the Refactoring to MVP

 Key Takeaways

 What’s Next?

20. Test-Driven Development Beckons to You

 What Is TDD?

 Make a New Place to Play with TDD

 Define the Requirements of the Time-of-Day Greeter

 Design the First Failing Test with Bare Production Code

 Make the First Test Pass with “Good Morning”

 Refactor the First Test to Make It More Expressive

 Repeat the TDD Steps for the Second Test

 Add Tests to Expand “Good Afternoon”

 Implement “Good Evening”

 Step Back to Refactor the Method as a Whole

 Add the Name to the Greeting

 Key Takeaways

 What’s Next?

 Bibliography

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