BLACK FRIDAY: Save 50% on my Swift books and videos! >>

How to do one-time setup for your tests

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.

Available from iOS

Did this solution work for you? Please pass it on!

Other people are reading…

About the Swift Knowledge Base

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

Swift on the server is here

Get ahead of the game and learn server-side Swift with my latest book – build real-world projects while you learn!

MASTER SWIFT NOW
Buy Testing Swift Buy Practical iOS 12 Buy Pro Swift Buy Swift Design Patterns Buy Swift Coding Challenges Buy Server-Side Swift (Vapor Edition) Buy Server-Side Swift (Kitura Edition) Buy Hacking with macOS Buy Advanced iOS Volume One Buy Advanced iOS Volume Two Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with Swift Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Beyond Code

Was this page useful? Let me know!

Click here to visit the Hacking with Swift store >>