ExemploTesteInterface_executarTesteLoginContaErrada.java

@Test
public void executarTesteLoginContaErrada() {

    //Insere o usuário no campo user
    onView(withId(R.id.user)).perform(typeText("Usuario"), closeSoftKeyboard());

    //Insere a senha no campo pass
    onView(withId(R.id.pass)).perform(typeText("Senha"), closeSoftKeyboard());

    //Clica no botao submit
    onView(withId(R.id.submit)).perform(click());

}