如何在ViewController单元测试中测试设置私有变量的方法？

Question

我有一个ViewController，它符合协议。 ViewController具有以下私有UI组件：backgroundImage，logoimage，loginButton和signupButton-所有这些都是私有的。 （因此无法通过单元测试访问）

如何在单元测试中测试以下协议方法的实现？我正在使用XCTestFramework进行单元测试。

extension ViewController : ViewControllerProtocol{
    func setbackgroundImage(_ image: UIImage) {
        backgroundImage.image = image
    }

    func setLogoImage(_ image: UIImage) {
        logoImage.image = image
    }

    func setLoginButtontitle(_ title: String) {
        loginButton.setTitle(title, for: .normal)
    }

    func setSignupButtonTitle(_ title: String) {
        signupButton.setTitle(title, for: .normal)
    }
}

protocol ViewControllerProtocol {
    func setbackgroundImage(_ image : UIImage)
    func setLogoImage(_ image : UIImage)
    func setLoginButtontitle(_ title: String)
    func setSignupButtonTitle(_ title: String)
    func setTitleLabel(_ title: String)
    func setContinuewithoutsignupTitle(_ title: String)
}

Answer 1

您仍然可以通过添加公共获取器对这些值进行单元测试

protocol ViewControllerProtocol {
    func setbackgroundImage(_ image : UIImage)
    func setLogoImage(_ image : UIImage)
    func setLoginButtontitle(_ title: String)
    func setSignupButtonTitle(_ title: String)
    func setTitleLabel(_ title: String)
    func setContinuewithoutsignupTitle(_ title: String)
    func getbackgroundImage() -> UIImage?
    func getlogoImage() -> UIImage?
    func getloginButtonTitle() -> String?
    func getsignupButtonTitle() -> String?
}

class MainTest: XCTestCase {

    let viewController = ViewController()

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

    func testExample() {
        guard let testImage1 = UIImage(named: "testImage1") else {
            XCTFail("Could not load test image 1")
            return
        }
        viewController.setbackgroundImage(testImage1)
        XCTAssert(viewController.getbackgroundImage() == testImage1)
        guard let testImage2 = UIImage(named: "testImage2") else {
            XCTFail("Could not load test image 2")
            return
        }
        viewController.setLogoImage(testImage2)
        XCTAssert(viewController.getlogoImage() == testImage2)
        viewController.setLoginButtontitle("test")
        XCTAssert(viewController.getloginButtonTitle() == "test")
        viewController.setSignupButtonTitle("test")
        XCTAssert(viewController.getsignupButtonTitle() == "test")
    }

}