Map<ClassWithTerribleHashCode, Integer> expected = new LinkedHashMap<>();
    Builder<ClassWithTerribleHashCode, Integer> builder = new Builder<>();
    int size = 18;
    for (int i = 0; i < size; i++) {
      ClassWithTerribleHashCode key = new ClassWithTerribleHashCode(i);
      builder.put(key, i);
      builder.put(key, -i);
      expected.put(key, -i);
    }