Doing dependency injection for our tests

DI - Snapshot.swift

class SuperHeroDetailViewControllerTests: XCTestCase {

    private let repository = MockSuperHeroesRepository()

    /* ... */

    private func openSuperHeroDetailViewController(_ superHeroName: String) -> UIViewController {
        let superHeroDetailViewController = ServiceLocator()
            .provideSuperHeroDetailViewController(superHeroName) as! SuperHeroDetailViewController
        superHeroDetailViewController.presenter = SuperHeroDetailPresenter(ui: superHeroDetailViewController,
            superHeroName: superHeroName,
            getSuperHeroByName: GetSuperHeroByName(repository: repository))
        let rootViewController = UINavigationController()
        rootViewController.viewControllers = [superHeroDetailViewController]
        return rootViewController
    }
}