}

  private static class ClassWithTerribleHashCode implements Comparable<ClassWithTerribleHashCode> {
    private final int value;

    ClassWithTerribleHashCode(int value) {
      this.value = value;
    }

    @Override
    public int compareTo(ClassWithTerribleHashCode that) {
      return Integer.compare(this.value, that.value);
    }

    @Override

    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);
    }