Jon Reid - iOS Unit Testing by Example

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For Kay, who believed in me

In these days of social media, direct marketing, and sponsored influence, there seems to be an arms race to devalue words as rapidly as possible. A mere two thousand years ago, a passion was a commitment to a cause or belief so powerful that it led to suffering, abandonment, and rejection from your closest personal friends, even to the greatest of personal sacrifices. Today, on my LinkedIn screen as I write this, I can see people who tell me that they are passionate about digital talent, advertising and marketing, and blockchain and broader financial technology. The message that each is conveying appears to be that theyre open to recruiters talking to them about paid work in those fields. Similarly, evangelism has shrunk in scope from announcing the good news from on high to working in marketing for a technology company.

Nonetheless, I have no hesitation in describing Jon Reid as a passionate evangelist for test-infectedtest-driven is not strong enoughdevelopment, and improving the quality of iOS apps. I worked with Jon at Facebook back in 2014, where he brought his trademark combination of enthusiasm, commitment, kindness, patience, and humility to bear on some particularly challenging problems. We had already met and collaborated both online and at conferences, and I knew this about Jon: everything he says about testing with iOS is not because he is the expert, but because he wants you to become the expert too. Not necessarily straight away, but he wants you to share in the beauty and power he sees and to develop the same care and appreciation about the topic.

This book will support you in that journey. Whether you picked it up because youre wondering why Xcode always asks you to include unit tests when you start a project, or because youre looking for specific tips to solve tricky problems and increase your test coverage, youll find help in here. I did. On the day that Jon sent me the manuscript, I was struggling with writing a test to show that one view controller presented another modally. I searched this book, and there was the answer. That makes it easy to write a conclusion for this foreword: read this book, because weve tested it, and it works.