steipete

The Ultimate Swift Testing Playbook (2024 WWDC Edition, expanded with Apple docs from June 2025)

Updated with info from https://developer.apple.com/documentation/testing fetched via Firecrawl on June 7, 2025.

See also my blog: See also my blog post: https://steipete.me/posts/2025/migrating-700-tests-to-swift-testing

A hands-on, comprehensive guide for migrating from XCTest to Swift Testing and mastering the new framework. This playbook integrates the latest patterns and best practices from WWDC 2024 and official Apple documentation to make your tests more powerful, expressive, and maintainable.

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1. Migration & Tooling Baseline

lukeredpath

I maintain the Community mobile app - a moderately large codebase that is fully modularized using Swift Package Manager and uses The Composable Architecture. I have recently completed the process of getting the project ready for Xcode 16 and Swift 6 and I wanted to outline the approach I took and some of the issues I encountered, especially regarding TCA.

The Approach

There are already [good

tgrapperon

import Foundation
public func printStackDepth(
  label: String? = nil,
  fileID: StaticString = #fileID,
  line: UInt = #line
) {
  let thread = pthread_self()
  let stackAddress = UInt(bitPattern: pthread_get_stackaddr_np(thread))
  var used: UInt = 0
  withUnsafeMutablePointer(to: &used) {

eddy-22

A curated list of useful command line apps, in celebration of the TUI.

“Knowledge brings fear” (Mars University Mission Statement)

If you want to contribute, you are highly encouraged to do so. Please read the contribution guidelines.

ilyagr

vimdiff comes as a pre-configured merge tool for jj and can be used with jj resolve out of the box. However, the default configuration for vimdiff as a diff editor (for jj split, etc.) is barely useable.

To more conveniently use Vim as a difftool for jj, try one of the following setups:

DirDiff plugin

1. Install the DirDiff Vim plugin.

BigZaphod

//
//  PagingView.swift
//  Wallaroo - https://wallaroo.app
//
//  Created by Sean Heber (@BigZaphod) on 8/9/22.
//

import SwiftUI

// This exists because SwiftUI's paging setup is kind of broken and/or wrong out of the box right now.

jemmons

import Foundation
typealias Continuation<Ret> = (Ret) -> Void
typealias ContinuationMonad<Value> = (@escaping Continuation<Value>) -> Void
typealias Transform<T,U> = (T) -> ContinuationMonad<U>


func async<Value>(_ wrappedValue: Value) -> ContinuationMonad<Value> {
  { $0(wrappedValue) }
}

macshome

This page is now depreacted!

Check out the repo instead. The Wisdom of Quinn Now with 100% more archived PDFs.

The Wisdom of Quinn

Informative DevForum posts from everyone's favorite DTS member.

(Arranged newest to oldest)

donnywals

#!/bin/sh

# make sure you have imagemagick installed: brew install imagemagick
# your app_icons.sh file should have the correct permissions: run `chmod 775 app_icons.sh` in your terminal from where you put this file
# put your `my_icon.png` next to this file and run ./app_icons.sh to export your app icons

x=my_icon.png
y=${x%.*}

# delete the export directory so we start clean

matthewtonkin

@implementation NSApplication (OpenAtLogin)

#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"

- (BOOL)openAtLogin
{
    LSSharedFileListItemRef loginItem = [self loginItem];
    BOOL result = loginItem ? YES : NO;