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.
