NEW: Subscribe to Hacking with Swift+ and accelerate your learning! >>

How to do one-time setup for your tests

Swift version: 5.2

Paul Hudson    @twostraws   

When you create a default XCTestCase using Xcode you’ll get default setUp() and tearDown() methods like these:

override func setUp() {
    super.setUp()
    // Put setup code here. This method is called before the invocation of each test method in the class.
}

override func tearDown() {
    // Put teardown code here. This method is called after the invocation of each test method in the class.
    super.tearDown()
}

Those are called before and after every test inside your XCTestCase subclass, which allows you to reset your testing environment fully. However, sometimes you prefer to do some setup once and keep that state during all your tests, for example if you need to generate some test data that gets shared in all your tests.

As well as the regular setUp() and tearDown() instance methods, you can also define class methods with the same names, like this:

override class func setUp() {
    super.setUp()
}

override class func tearDown() {
    super.tearDown()
}

Unlike their instance method equivalents, these two class methods will be run only once each: setUp() before all your tests are run, and tearDown() after all your tests have completed.

Hacking with Swift is sponsored by Instabug

SPONSORED Are you tired of wasting time debugging your Swift app? Instabug’s SDK is here to help you minimize debugging time by providing you with complete device details, network logs, and reproduction steps with every bug report. All data is attached automatically, and it only takes a line of code to setup. Start your free trial now and get 3 months off exclusively for the Hacking with Swift Community.

Start your free trial!

Sponsor Hacking with Swift and reach the world's largest Swift community!

Available from iOS

Similar solutions…

About the Swift Knowledge Base

This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.

BUY OUR BOOKS
Buy Pro Swift Buy Swift Design Patterns Buy Testing Swift Buy Hacking with iOS Buy Swift Coding Challenges Buy Swift on Sundays Volume One Buy Server-Side Swift (Vapor Edition) Buy Advanced iOS Volume One Buy Advanced iOS Volume Two Buy Advanced iOS Volume Three Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with macOS Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Server-Side Swift (Kitura Edition) Buy Beyond Code

Was this page useful? Let us know!

Average rating: 3.7/5

Link copied to your pasteboard.