assertPutString(new char[] {'p', HashTestUtils.randomHighSurrogate(new Random())});
  }

  public void testPutStringWithLowHighSurrogate() {
    assertPutString(
        new char[] {
          HashTestUtils.randomLowSurrogate(new Random()),
          HashTestUtils.randomHighSurrogate(new Random())
        });
  }

  public void testPutStringWithHighLowSurrogate() {