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Test-Driven iOS Development

Test-Driven iOS Development

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  • Copyright 2012
  • Dimensions: 7" x 9"
  • Edition: 1st
  • eBook (Watermarked)
  • ISBN-10: 0-13-276407-5
  • ISBN-13: 978-0-13-276407-0

As iOS apps become increasingly complex and business-critical, iOS developers must ensure consistently superior code quality. This means adopting best practices for creating and testing iOS apps. Test-Driven Development (TDD) is one of the most powerful of these best practices. Test-Driven iOS Development is the first book 100% focused on helping you successfully implement TDD and unit testing in an iOS environment.

Long-time iOS/Mac developer Graham Lee helps you rapidly integrate TDD into your existing processes using Apple’s Xcode 4 and the OCUnit unit testing framework. He guides you through constructing an entire Objective-C iOS app in a test-driven manner, from initial specification to functional product. Lee also introduces powerful patterns for applying TDD in iOS development, and previews powerful automated testing capabilities that will soon arrive on the iOS platform. Coverage includes

  • Understanding the purpose, benefits, and costs of unit testing in iOS environments
  • Mastering the principles of TDD, and applying them in areas from app design to refactoring
  • Writing usable, readable, and repeatable iOS unit tests
  • Using OCUnit to set up your Xcode project for TDD
  • Using domain analysis to identify the classes and interactions your app needs, and designing it accordingly
  • Considering third-party tools for iOS unit testing
  • Building networking code in a test-driven manner
  • Automating testing of view controller code that interacts with users
  • Designing to interfaces, not implementations
  • Testing concurrent code that typically runs in the background
  • Applying TDD to existing apps
  • Preparing for Behavior Driven Development (BDD)

The only iOS-specific guide to TDD and unit testing, Test-Driven iOS Development covers both essential
concepts and practical implementation.

Sample Content

Table of Contents

Dedication    v

Preface    xii

Acknowledgments    xiv

About the Author    xiv

1  About Software Testing and Unit Testing    1

What Is Software Testing For?    1

Who Should Test Software?    2

When Should Software Be Tested?    6

Examples of Testing Practices    7

Where Does Unit Testing Fit In?    7

What Does This Mean for iOS Developers?    11

2  Techniques for Test-Driven Development    13

Test First    13

Red, Green, Refactor    15

Designing a Test-Driven App    18

More on Refactoring    19

Ya Ain’t Gonna Need It    19

Testing Before, During, and After Coding    21

3  How to Write a Unit Test    23

The Requirement    23

Running Code with Known Input    24

Seeing Expected Results    26

Verifying the Results    26

Making the Tests More Readable    28

Organizing Multiple Tests    29

Refactoring    32

Summary    34

4  Tools for Testing    35

OCUnit with Xcode    35

Alternatives to OCUnit    46

Google Toolkit for Mac    46

GHUnit    47

CATCH    48

OCMock    50

Continuous Integration    52

Hudson    53

CruiseControl    57

Summary    58

5  Test-Driven Development of an iOS App    59

Product Goal    59

Use Cases    60

Plan of Attack    63

Getting Started    64

6  The Data Model    67

Topics    67

Questions    73

People    75

Connecting Questions to Other Classes    76

Answers    81

7  Application Logic    87

Plan of Attack    87

Creating a Question    88

Building Questions from JSON    102

8  Networking Code    113

NSURLConnection Class Design    113


Implementation    114

Conclusion    125

9  View Controllers    127

Class Organization    127

The View Controller Class    128

TopicTableDataSource and TopicTableDelegate    133

Telling the View Controller to Create a New View Controller    149

The Question List Data Source    158

Where Next    170

10  Putting It All Together    171

Completing the Application’s Workflow    171

Displaying User Avatars    185

Finishing Off and Tidying Up    189

Ship It!    199

11  Designing for Test-Driven Development    201

Design to Interfaces, Not Implementations    201

Tell, Don’t Ask    203

Small, Focused Classes and Methods    204

Encapsulation    205

Use Is Better Than Reuse    205

Testing Concurrent Code    206

Don’t Be Cleverer Than Necessary    207

Prefer a Wide, Shallow Inheritance Hierarchy    208

Conclusion    208

12  Applying Test-Driven Development to an Existing Project    209

The Most Important Test You’ll Write Is the First    209

Refactoring to Support Testing    210

Testing to Support Refactoring    212

Do I Really Need to Write All These Tests?    213

13  Beyond Today’s Test-Driven Development    215

Expressing Ranges of Input and Output    215

Behavior-Driven Development    216

Automatic Test Case Generation    217

Automatically Creating Code to Pass Tests    219

Conclusion    220

Index    221


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