Main.swift implementation to fix leaky coverage in Unit Tests (with Unit Tests)

main.swift

//
//  main.swift
//
//  Created by Garo Hussenjian on 8/20/16.
//  Copyright © 2016 Xapnet, Inc. All rights reserved.
//

import UIKit

extension ProcessInfo {
    static func isUnitTesting() -> Bool {
        return NSClassFromString("XCTestCase") != nil
    }
}

extension UIApplicationDelegate {
    static func classNameIfRunning(_ isUnitTesting: (() -> Bool) = ProcessInfo.isUnitTesting) -> String? {
        return isUnitTesting() ? nil : NSStringFromClass(self)
    }
}

extension UIApplication {
    @discardableResult static func main(with delegate: UIApplicationDelegate.Type) -> Int32 {
        return CommandLine.unsafeArgv.withMemoryRebound(to: UnsafeMutablePointer<Int8>.self,
                                                        capacity: Int(CommandLine.argc)) { argv in
            UIApplicationMain(CommandLine.argc, argv, nil, delegate.classNameIfRunning())
        }
    }
}

UIApplication.main(with: AppDelegate.self)


/*-------------------------------------------------------------------------------------------*/
//
//  MainTests.swift
//
//  Created by Garo Hussenjian on 8/21/16.
//  Copyright © 2016 Xapnet, Inc. All rights reserved.
//

import XCTest
@testable import CoreListApp

class MainTests: XCTestCase {

    func testProcessInfo_WhenRunningTests_TestingReturnsTrue() {
        XCTAssertTrue(ProcessInfo.isUnitTesting(), "isUnitTesting() should return true when testing")
    }

    func testAppDelegate_WhenRunningTests_ClassNameReturnsNil() {
        let testingClassName = AppDelegate.classNameIfRunning() { return true }
        XCTAssertNil(testingClassName, "className() should return nil when running tests")
    }

    func testAppDelegate_WhenRunningApp_ClassNameReturnsCorrectName() {
        let runningClassName = AppDelegate.classNameIfRunning() { return false }
        XCTAssertEqual(runningClassName, NSStringFromClass(AppDelegate.self),
                       "className() should be correct value when running app")
    }
}