@Test
  public void testGenericExtends() {
    ImmutableSet<Integer> ints = ImmutableSet.of(1, 2, 3);
    GenericExtends g = GenericExtends.builder().setMetrics(ints).build();
    assertThat(g.metrics()).isEqualTo(ints);
  }
Notice that this is called ReleaseInfoBuilder and not Builder.
value/src/it/functional/src/test/java/com/google/auto/value/AutoValueTest.java