Sample iOS Unit Tests: Working with a ViewController composed of a UILabel

Sample iOS Unit Tests: Working with a ViewController composed of a UILabel

import XCTest
@testable import UnitTests

class ExampleTests: XCTestCase {

    var viewControllerUnderTest: ViewController!

    override func setUp() {

        super.setUp()

        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        self.viewControllerUnderTest = storyboard.instantiateViewControllerWithIdentifier("ViewController") as! ViewController
        
        self.viewControllerUnderTest.loadView()
        self.viewControllerUnderTest.viewDidLoad()
    }

    override func tearDown() {
    
        super.tearDown()
    }

    func testViewControllerIsComposedOfLabel() {

        XCTAssertNotNil(self.viewControllerUnderTest.label, "ViewController under test is not composed of a UILabel")
    }

    func testViewControllerInitializesLabelText() {

         XCTAssert(self.viewControllerUnderTest.label.text == "Vader", "ViewController under test does not initialize the text property of UILabel correctly")
    }
    
    func testLabelAfterButtonTap() {
        
        let button: UIButton = UIButton()
        viewControllerUnderTest.handleTap(button)
        
        let expectedLabelText = "Hello testing"
        let actualLabelText = viewControllerUnderTest.label.text
        
        XCTAssertEqual(expectedLabelText, actualLabelText, "Label text of: \(expectedLabelText) not equal to text: \(actualLabelText)")
    }
}

Hello Dear,
You did good work on unit testing. It's appreciatable and helpful material.
I just tried your code also but still facing a problem.
Xcode report an error with description which is "Could not cast value of type 'UnitTetsingDemo.ViewController' (0x105b871d8) to 'UnitTetsingDemoTests.ViewController' (0x1201929b0)".
Please help me how I resolve this issue.
Thanks in advance :)

@sAurangzaib, I have same issue. Did you solve this issue?