Problem with Unowned in closure

gistfile1.txt

import UIKit

class UnownedDemo {
    func takeClosure(completion: @escaping () -> Void) {
        DispatchQueue.main.asyncAfter(deadline: .now() + 5) {
            completion()
        }
    }
}



class Test {
    let unownedDemo = UnownedDemo()

    func testClosure()  {
        unownedDemo.takeClosure { [unowned self] in
//        unownedDemo.takeClosure { [weak self] in
            self?.callHeMan()
        }
    }

    private func callHeMan() {
        print("Hello He Man")
    }
}

class Test2 {
    var test: Test? = Test()

    func disposeTest() {
        DispatchQueue.main.asyncAfter(deadline: .now() + 1) {
            print("disposed...")
            //            self.test = nil
        }
    }

    func call() {
        print("Calling...")
        test?.testClosure()
    }

    func callWithDispose() {
        print("callWithDispose...")
        test?.testClosure()
        disposeTest()
    }
}

let test2 = Test2()
//test2.call()
test2.callWithDispose()