DashboardCoordinatorSpec.swift

import Quick
import Nimble

@testable import myapp

final class PusherDouble: Pushing {
    private(set) var didPresentTarget: UIViewController?
    private(set) var didPresentFrom: UIViewController?
}

extension PusherDouble {
    func push(_ target: UIViewController, from parent: UIViewController) {
        didPresentFrom = parent
        didPresentTarget = target
    }
}

final class DashboardCoordinatorSpec: QuickSpec {
    override func spec() {
        context("init") {
            var sut: DashboardCoordinator!
            var pusherDouble: PusherDouble!
            
            beforeEach() {
                pusherDouble = PusherDouble()
                sut = DashboardCoordinator()
                sut.pusher = pusherDouble
            }
            
            context("when pushing dashboard screen") {
                var parent: UIViewController!
                var dashboardScreen: UIViewController!
                
                beforeEach() {
                    parent = UIViewController()
                    dashboardScreen = UIViewController()
                    sut.dashboardScreenFactory = { dashboardScreen }
                    sut.pushDashboardScreen(from: parent)
                }
                
                it("should push from the parent screen and the correct target") {
                    expect(pusherDouble.didPresentFrom) === parent
                    expect(pusherDouble.didPresentTarget) === dashboardScreen
                }
            }
        }
    }
}