The hidden cost of @testable Swift's @testable annotation affects how a module is imported, changing its access control to simplify testing. In this interesting post, Paul Samuels argues that there are hidden costs to using this feature. I don't entirely agree with everything Paul states, but it's always good to consider a different point of view. Posted on April 27, 2021 | testing
XCTest tips and tricks that can level up your Swift testing Testing is such a critical part of the software development process that it's always great to learn some new test-related tricks. In this post, Joe Masilotti shares some of his favorite XCTest tips he picked up over the past few years. Swift code samples included. Posted on February 19, 2021 | testing
Testing the UI without UI Testing in Swift Testing the user interface is an essential part of software development. Unfortunately, UI testing frameworks such as Apple's XCUITest are often unreliable and slow. However, there are other methods of testing the user interface, and in this post, Joe Masilotti shows us how to write UI tests using XCTest, Apple's unit testing framework. Posted on December 6, 2020 | testing
Unit Testing Asynchronous Code in Swift Implementing unit tests for asynchronous logic presents challenges such as false-positive test results and untrustworthy or error-prone test executions. In this post, Vadim Bulavin describes four patterns that help us to deal with such challenges, enabling us to reliably test asynchronous code. Posted on November 16, 2020 | testing asynchronous
Testing delegates and protocols in XCTest The delegate pattern uses composition to provide similar advantages to object inheritance and is a pattern commonly used when developing for Apple's platforms. In this short post, Sarun Wongpatcharapakorn demonstrates his technique for testing code which uses delegation. Posted on September 17, 2020 | testing xctest
Unit testing retain cycles Paul Samuels demonstrates how we can use two helper functions to easily unit test for retain cycles. Posted on November 27, 2018 | testing retain
Async/await in Swift unit tests John Sundell shows us how to use the async/await programming paradigm to write concise unit tests for asynchronous code. Posted on September 25, 2018 | asynchronous testing
Refactoring Swift code for testability John Sundell describes pure functions and dependency injection - two techniques we can apply when refactoring Swift code to make it more testable. Posted on July 22, 2018 | refactoring testing
Swift Evolution - RFC: In-Line Tests In this RFC, Robert Widmann suggests a very interesting Swift evolution idea. Robert comments that currently, unit testing in Swift feels like a second-class citizen, and comes with significant overhead. To improve the situation, he suggests the idea of in-line tests, enabling us to add unit tests right next to the code being tested. I really like this idea. 👍🏽. Posted on April 28, 2018 | testing
The Cake Pattern with Swinject Peter-John Welcome demonstrates how we can use the Swinject framework together with the cake pattern to implement dependency injection. The major benefit is decoupling of components, which in turn means easier unit testing. Posted on April 24, 2018 | injection testing