@Test
  public void stepBuilder() {
    Stepped stepped = Stepped.builder().setOne("one").setTwo(2).setThreeAndBuild(3.0);
    assertThat(stepped.one()).isEqualTo("one");
    assertThat(stepped.two()).isEqualTo(2);
    assertThat(stepped.three()).isEqualTo(3.0);
  }
Notice that this is called ReleaseInfoBuilder and not Builder.
value/src/it/functional/src/test/java/com/google/auto/value/AutoValueTest.java