Quality Coding: Unit Testing and TDD for iOS Developers

We started from zero TDD

Jon really helped me understand what I should be testing when I didn't know where to start. My team started from zero TDD and my successes in it have inspired the rest of the team to start.

Oliver Foggin Senior iOS developer

How to Write Clean Code

Unit Testing

A robust suite of unit tests acts as a safety harness, giving you courage to make bold changes. But there’s an art to making tests that give you useful information, while keeping the tests themselves readable & maintainable.

TDD

Unit tests written after production code are hard to write, and may only confirm your biases. Test-Driven Development shapes production code in response to tests, in an evolutionary manner. The secret sauce? Continuous Refactoring.

Design

We can’t just bang code together and expect it to be testable. Testability must be designed in. That design brings other benefits, making it easier to modify the code. The ultimate goal? Drive down your cost of change.

Discover the Quality Coding Blog

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Joy! Xcode 10 Promises to Improve Test-Centric Workflows

Do You Refactor without Tests? It’s Time for Safety

The single biggest influence

Jon approaches software as a craftsman. In my years as a professional, learning from Jon has probably been the single biggest influence on the way I write software today.

Rick Van Voorden
iPhone Developer

Even customers are asking for tests now!

I have to blame Jon. As I read through code, I start thinking about how can I test something, instead of simply adding another "quick fix." It's paying off, as more and more of the team catch their first bug using tests, or sleep better at night. Even customers are asking for tests now!

Diego Freniche
Mobile developer