FreshValueGenerator generator = new FreshValueGenerator();
    assertValueAndTypeEquals(expected, generator.generateFresh(type));
    assertThat(generator.generateFresh(type)).isNull();
  }

  private static void assertNotInstantiable(TypeToken<?> type) {
    assertThat(new FreshValueGenerator().generateFresh(type)).isNull();
  }

  private static void assertValueAndTypeEquals(Object expected, Object actual) {