Test Driven Development for iOS
What you'll learn
Course Description — Test-Driven Development for iOS
Test-Driven Development isn’t just about writing tests — it’s about building better software.
This course teaches you how to design, structure, and ship iOS apps using testing as a core engineering tool. You’ll learn how to write reliable, maintainable tests and how to use TDD to guide your architecture, catch bugs early, and refactor confidently.
Through a series of real, progressively complex app projects, you’ll gain hands-on experience with unit testing, UI testing, networking tests, CI/CD integration, and performance profiling in SwiftUI.
What You’ll Build & Learn
1. Foundations of TDD + Simple App Testing
We begin with a Savings Calculator app to establish the fundamentals of TDD:
- Writing meaningful unit tests for business logic
- Creating UI tests for user-driven flows
- Structuring small features with testability in mind
- Understanding red–green refactor and test-driven iteration
This module gives you the core mechanics you’ll use throughout the course.
2. Networking Tests with a Real Crypto App
Next, you’ll build a Crypto Tracker app and learn how to test code that relies on external data:
- Writing tests for asynchronous and concurrent networking code
- Mocking API calls and validating request/response handling
- Testing error paths, decoding, and edge cases
- Ensuring networking code is fully deterministic and repeatable
You’ll see exactly how testing influences architecture in real-world scenarios.
3. Advanced UI Testing: Full Onboarding Flow
We then move into complex UI testing by building and testing a multi-step onboarding experience:
- UI tests for navigation, state transitions, and conditional flows
- Testing forms, validation, buttons, and multi-screen logic
- Creating stable, resilient tests that survive UI changes
- Designing views and view models that support maintainable test suites
This module teaches you how to write UI tests with real engineering value.
4. CI/CD Integration with Xcode & GitHub Actions
With a full suite of tests in place, you’ll learn how to automate your workflow using CI/CD:
- Setting up test automation with GitHub Actions
- Running tests on every pull request or code change
- Generating build artifacts and preparing releases
- Understanding how CI enforces code quality on real teams
You’ll leave with a production-ready pipeline and a deeper understanding of how testing fits into modern development practices.
5. Performance Testing & Profiling SwiftUI
The course wraps with a deep dive into performance testing using Xcode Instruments:
- Using the Time Profiler, Allocations, and SwiftUI tools
- Measuring view refresh cycles and identifying unnecessary work
- Detecting performance bottlenecks in SwiftUI apps
- Using data-based insights to refactor for speed and efficiency
You’ll learn how professional teams diagnose and optimize iOS performance.
By the End of This Course, You Will…
- Understand how to apply TDD to real iOS apps
- Know how to write unit, UI, and networking tests that genuinely improve code quality
- Design features that are inherently more testable, intentional, and maintainable
- Confidently refactor existing codebases without fear
- Build and automate a full test pipeline with CI/CD
- Profile and measure SwiftUI performance like an advanced engineer
- Gain skills that stand out in interviews and on real production teams
Who This Course Is For
This course is designed for developers who want to:
- Level up their engineering skillset
- Build scalable apps with fewer bugs
- Understand how testing drives architecture
- Stand out in interviews or senior-level roles
- Improve confidence in refactoring and shipping code
Whether you're newer to testing or looking to deepen your skills, this course gives you the practical, hands-on experience needed to think and build like a professional iOS engineer.
Curriculum
Meet Stephan,
Your Instructor and Mentor
With 1000+ hours of content and 15 courses, Stephan Dowless makes coding approachable and fun. As a former Meta engineer, he combines real-world experience with clear, engaging teaching to help you succeed in tech.
Stephan is a seasoned iOS developer with over a decade of experience in the tech industry. His expertise spans across building scalable, production-ready applications that are designed to handle millions of users, incorporating advanced features, and optimizing performance.
Throughout his career, Stephan has been passionate about not only writing impeccable code but also about mentoring and elevating fellow developers. This passion led him to create the Pro Plus series, where he distills his extensive industry knowledge and real-world experience into comprehensive, high-quality courses.
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Success Stories
Our students are getting hired at top companies. We can help you get there too.
"I cannot express enough how grateful I am for the incredible journey AppStuff has taken me on in my pursuit of becoming an iOS engineer. As a student aspiring to break into the world of app development, I was initially overwhelmed by the complexity of iOS development. That's when I stumbled upon AppStuff, and it truly transformed my learning experience."
"Today, I proudly call myself an iOS engineer, and I owe a significant part of my success to AppStuff. With their guidance and resources, I not only gained the knowledge and skills but also the confidence to pursue a career in iOS development. I am now equipped to tackle challenging projects and contribute meaningfully to the world of mobile app development."
"If you're a student with dreams of becoming an iOS engineer, I highly recommend AppStuff as your go-to resource. Trust me, it's the perfect launchpad for your iOS development journey. Thank you, AppStuff, for making my dream a reality!"
“I’ve worked with a lot of codebases over the years, and Stephan’s immediately stood out. The moment I dove into his Messenger app, everything just clicked. The structure, the clarity, the architecture — it all spoke to me.
Retrofitting it to my own backend built with Vapor and Postgres was surprisingly seamless. I don’t say this lightly: I’m picky about code quality, and Stephan’s work is among the best I’ve ever seen.
His production-ready Pro Plus templates set a new standard for iOS development — they’re more than learning tools, they’re professional-grade systems you can actually build on.”
Stephan Dowless consistently puts out some of the most in-depth and well-rounded iOS tutorials I’ve ever come across. His courses don’t just scratch the surface—they fully cover what they teach, which is something I really appreciate in a landscape where many tutorials leave out key details.
What sets Stephan apart even more is how he continues to evolve his courses year after year, always staying up to date with the latest coding standards and best practices. You can tell he genuinely cares about the quality of his content and the success of his students.
If you’re serious about mastering iOS development, I couldn’t recommend his courses more.
Common Questions, Answered
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All courses are available with the monthly and yearly membership plan, except for Pro Plus courses. Pro Plus courses are only available with Lifetime membership. Monthly/yearly members receive 15% off.
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