Screen checks

Screen is abstraction that represents Activity, Fragment or View in tests.
Screen has a property checks of type ScreenChecks with single function isScreenOpened.
ScreenChecks has a property checkOnEachScreenInteraction. It executes isScreenOpened() on each interaction with ViewElement on the Screen.

Warning

checkOnEachScreenInteraction works only if ViewElement is created by element() function

Manual check

screen.checks.isScreenOpened()

Writing a custom check

class MyScreen : SimpleScreen() {
  
    override val checks = MyScreenChecks()

    class MyScreenChecks(screen: MyScreen) :
        SimpleScreenChecks<MyScreen>(screen = screen, checkOnEachScreenInteraction = true) {
    
        override fun screenOpenedCheck() {
            super.screenOpenedCheck()
            // Put additional checks here
        }
    }    
}

How to use the same Screen with different behavior

It may be useful when one Screen contains different UI states.

fun Screen.myScreen(title: String? = null) = MyScreen(title)

class MyScreen(val title: String? = null) : SimpleScreen() {

    class Checks(screen: MyScreen) :
        SimpleScreenChecks<MyScreen>(screen = screen) {

        override fun screenOpenedCheck() {
            super.screenOpenedCheck()
            if (title != null) {
                title.checks.withText(title)
            }
        }
    }    
}