Tools by Jon Reid

Approval Tests are an alternative to assertions. You’ll find them useful for testing objects with complex values (such as long strings), lots of properties, or collections of objects.

Blog posts:

• ApprovalTests for Powerful Assertions in Swift: How to Get Started
• How to Verify Objects (and Simplify TDD) using ApprovalTests.Swift
• How to Verify Arrays and See Simple, Clear Diffs using ApprovalTests.Swift
• Write Parameterized Tests in ApprovalTests.Swift by Transforming Sequences
• Like Magic: How to Wrangle Legacy Code with Combination Approvals

Apps to disable/enable Time Machine backups.

An assertion for asynchronous code. For both XCTest and Swift Testing.

Write expressive custom assertions that work on either Swift Testing or XCTest.

Template to annotate commits with different risk levels using Arlo’s Commit Notation.

The Objective-C implementation of Hamcrest. It’s library of predefined matchers (which you can use in test assertions), and a framework for creating your own matchers.

Blog posts:

• Hamcrest: A Tool for Readable, Powerful Unit Tests
• How OCHamcrest’s “hasProperty” Can Make Your Tests Simpler
• What Benefits Are There in the New, Improved OCHamcrest?
• How to Make Your Own OCHamcrest Matcher for Powerful Asserts

The Objective-C implementation of Mockito. It supports creation, verification and stubbing of mock objects.

Blog posts:

• Can OCMockito’s New Error Reporting Save You Time?

Apple's Swift Testing template is better than what they give us for XCTest. Now let's improve it further with a custom file template.

Blog posts:

• Swift Testing Template: Download My Improved Custom Template

Code snippets to help you write test cases. Available to all new subscribers. Includes:

• Swift Testing
• SwiftUI
• Swift UIKit
• Swift XCTest
• Objective-C

TestableView improves SwiftUI unit testing by cutting through the clutter of boilerplate code, letting you zero in on what matters: your test's intent.

Unit test UIKit alerts, presented view controllers, and dismissed view controllers.

Blog posts:

• How to Test UIAlertControllers (and Control Swizzling)

A simple way to generate reports of the Objective-C code coverage of your Xcode project. Generated reports include HTML and Cobertura XML.

Blog posts:

• How to Easily Measure Code Coverage in Xcode
• Code Coverage Fixed for Xcode 5.1

Apple’s template fills test suites with cruft. By contrast, these test suite templates are sleek. They contain a single failing test, nothing else.

Blog posts:

• Is Apple Stuffing Your Code with Pointless Cruft?
• Would You Like an Improved Swift Unit Testing Template?

A bad piece of code you can use for refactoring exercises, originally created by David Tanzer. Can you add tests, and clean up the code?

Learn Test-Driven Development by following the steps in this exercise, originally created by Robert Martin.

Blog posts:

• Xcode TDD Kata: Practice with the Bowling Game

Swift refactoring exercise to teach Many of One pattern.

When you refactor, are you using small steps?

Blog posts:

• When You Refactor, Are You Using Small Steps?

“Refactor in Small Steps” part two

Blog posts:

• Refactoring: How Do You Clean a Mess, Safely?

An iOS view controller with unit tests, so you can play with ways to refactor it.

Blog posts:

• Refactor Like a Pro: The No-Brainer Guide to Converting to MVVM
• Unlock Proven Steps of Refactoring to MVVM in Swift (Part 2)
• Refactor like a Pro: Adopt the Null Object Pattern with Small, Verified Steps

A “Paint by Numbers” TDD exercise originally created by Jeff Langr. We have provided the tests for you, all disabled. Your job is to do the rest: make the tests pass, then make your code clean. Sample solutions are provided.