@Test
  public void testEncryptDecryptString() throws Exception {
    StreamingTestUtil.testEncryptDecryptString(defaultAesHkdfStreamingInstance);
  }
Encrypts and decrypts a with non-ASCII characters using CharsetEncoders and CharsetDecoders.
java_src/src/test/java/com/google/crypto/tink/subtle/AesGcmHkdfStreamingTest.java