Android: how to lose focus on editText when testing with espresso

Issue

I want to test my error message in my android app. My error check only happens when the focus of my editText changes.

@Test
    fun wrongFirstname(){
        onView(withId(R.id.txtFirstNameRegister)).perform(typeText(""))
        //here I need to lose my focus
        onView(withId(R.id.txtFirstNameRegister)).check(matches(hasErrorText(R.string.firstNameCheckError.toString())))
    }

Solution

From what I know there is no explicit method that allows you to just lose focus, this is also not an action a user can perform hence it is not included in espresso.

You can of course use a different method resulting in loss of focus such as clicking on a different component:

onView(withId(R.id.some_view)).perform(click()) 

Answered By - Anton