Teste com Espresso

Conversa.java

package com.example.android.conversa;

import android.support.test.rule.ActivityTestRule;
import android.support.test.runner.AndroidJUnit4;

import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;

import static android.support.test.espresso.Espresso.onView;
import static android.support.test.espresso.action.ViewActions.click;
import static android.support.test.espresso.action.ViewActions.typeText;
import static android.support.test.espresso.assertion.ViewAssertions.matches;
import static android.support.test.espresso.matcher.ViewMatchers.isDisplayed;
import static android.support.test.espresso.matcher.ViewMatchers.withId;
import static android.support.test.espresso.matcher.ViewMatchers.withText;

@RunWith(AndroidJUnit4.class)
public class EspressoUITest {
    @Rule
    public ActivityTestRule mActivityRule = new ActivityTestRule<>(MainActivity.class);

    @Test
    public void testarActivities(){
        onView(withId(R.id.enviar)).perform(click());
        onView(withId(R.id.titulo1)).check(matches(isDisplayed()));

        onView(withId(R.id.enviar1)).perform(click());
        onView(withId(R.id.titulo)).check(matches(isDisplayed()));
    }
    @Test
    public void testeInputOutput(){
        onView(withId(R.id.mensagem)).perform(typeText("I've heard that Rosario is Batman"));
        onView(withId(R.id.enviar)).perform(click());
        onView(withId(R.id.mensagem_recebida1)).check(matches(withText("I've heard that Rosario is Batman")));
    }
}