Provide @StartActivity annotation put on test method to automatically start it or use @Location from Graphene to do so

@Test
@InSequence(4)
@OperateOnDeployment("todo-mobile-app")
public void loginUserInMobile(@ArquillianResource AndroidDevice device) {
        device.getActivityManagerProvider()
            .getActivityManager()
            .startActivity("org.jboss.aerogear.todo.activities.LoginActivity");

        loginMobileFragment.login("john", "123");
}

=========================

@Test
@InSequence(4)
@OperateOnDeployment("todo-mobile-app")
@StartActivity("org.jboss.aerogear.todo.activities.LoginActivity")
public void loginUserInMobile() {
    loginMobileFragment.login("john", "123");
}