如何在Swift中使用XCAssert检查isViewLoaded？

Question

I'm writing XCUITests and I'd like to check if my ViewController has loaded. I'm thinking thinking to access the isViewLoaded Bool property. How would that look as an assertion?

func XCTAssert(isViewLoaded == true, "MyViewController view loaded successfully")

The above code gives me an error. How would it look?

Answer 1

You have to call isViewLoaded on an actual instance of a view controller. And the message you provide should indicate that the assertion failed, not succeeded.

let vc = ... // some view controller

XCTAssert(vc.isViewLoaded, "MyViewController view failed to load")

Answer 2

The first parameter is what you want to happen - your expectation. The second parameter is the message that is used when an assertion FAILS. So you have to do it like this:

let viewController = UIViewController()
XCTAssertTrue(viewController.isViewLoaded, "viewcontroller's view failed loading")