@Test
  public void testOuterWithDefaultableInner_Defaults() {
    DefaultableInner defaultInner = DefaultableInner.builder().build();
    OuterWithDefaultableInner x = OuterWithDefaultableInner.builder().build();
    assertThat(x.names()).isEmpty();
    assertThat(x.inner()).isEqualTo(defaultInner);
  }
Notice that this is called ReleaseInfoBuilder and not Builder.
value/src/it/functional/src/test/java/com/google/auto/value/AutoValueTest.java