How to speed up UI test cases in Xcode?

Question

Since Xcode 7 we have a nice API for UI testing. Mostly I\'m satisfied with it. The only concern is related to the speed.

In the beginning an ordina

Answer 1

I decrease my UITests time in 30%, follow all steps:

When you run your app, add the argument:

let app = XCUIApplication()

override func setUp() {
    super.setUp()

    continueAfterFailure = false
    app.launchArguments += ["--Reset"]
    app.launch()
}

Now, in your AppDelegate add:

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    setStateForUITesting()
}

static var isUITestingEnabled: Bool {
    get {
        return ProcessInfo.processInfo.arguments.contains("--Reset")
    }
}

private func setStateForUITesting() {
    if AppDelegate.isUITestingEnabled {
        // If you need reset your app to clear state
        UserDefaults.standard.removePersistentDomain(forName: Bundle.main.bundleIdentifier!)

        // To speed up your tests
        UIApplication.shared.keyWindow?.layer.speed = 2
        UIView.setAnimationsEnabled(false)
    }
}

In your code, to verify if is in test mode, you can use:

if AppDelegate.isUITestingEnabled {
    print("Test Mode")
}

Additionally, to can wait while the element load I created this extension:

import XCTest

extension XCUIElement {
    func tap(wait: Int, test: XCTestCase) {
        if !isHittable {
            test.expectation(for: NSPredicate(format: "hittable == true"), evaluatedWith: self, handler: nil);
            test.waitForExpectations(timeout: TimeInterval(wait), handler: nil)
        }
        tap()
    }
}

Use like this:

app.buttons["start"].tap(wait: 20, test: self)