Application as a function blog post code

reduce.kt

fun reduce(action: Action, state: State): Effect

test.kt

@Test
fun `GIVEN user is logged in WHEN app moves to the background THEN user is logged out`() {
    Case.given(State(user = LoggedInUser(username = "Dori")))
        .andWhen(ApplicationBackgrounded)
        .then { newState ->
            assertThat(newState.user).isOfType(AnonomousUser)
        }
}