Segue Example Tests

FirstViewController.swift

import UIKit

class FirstViewController: UIViewController {

    @IBOutlet weak var nextButton: UIButton!

    @IBAction func didTapNextButton() {
      performSegue(withIdentifier: "moveToSecondScreen", sender: nil)
    }
}

SegueExampleTests.swift

import XCTest
import Nimble

@testable import ios_segue_test_example

class SegueExampleTests: XCTestCase {
    
    var vc: FirstViewController!
    
    override func setUp() {
        super.setUp()
        continueAfterFailure = false
        
        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        vc = storyboard.instantiateInitialViewController() as! FirstViewController
        vc.appear()
    }
    
    func testMovingToTheNextScreen() {
        let navVC = UINavigationController(rootViewController: vc)

        expect(navVC.visibleViewController).to(beIdenticalTo(vc))
        
        vc.nextButton.tap()
        
        expect(navVC.visibleViewController).toEventually(beAnInstanceOf(SecondViewController.self))
    }
    
}