Base class for view controller tests in Swift

ViewControllerTests.swift

@testable import MyApp
import UIKit
import XCTest

class ViewControllerTests: XCTestCase {
    var storyboard: UIStoryboard!

    func storyboardName() -> String {
        return "Main"
    }

    override func setUp() {
        super.setUp()
        storyboard = UIStoryboard(name: storyboardName(), bundle: nil)
    }

    func viewControllerWithIdentifier<T>(identifier: String) -> T {
        return storyboard.instantiateViewControllerWithIdentifier(identifier) as! T
    }
}