} else {
      assertEquals(expectedHashCode.asLong.longValue(), hash.asLong());
    }
    assertThat(hash.toString()).isEqualTo(expectedHashCode.toString);
    assertSideEffectFree(hash);
    assertReadableBytes(hash);
  }

  private static void assertSideEffectFree(HashCode hash) {
    byte[] original = hash.asBytes();
    byte[] mutated = hash.asBytes();
    mutated[0]++;
    assertThat(hash.asBytes()).isEqualTo(original);