@Test
  public void testEncryptDecryptRandomAccessSmall() throws Exception {
    Assume.assumeFalse(TinkFips.useOnlyFips());

    testEncryptDecryptRandomAccess(16, 12, 256, 0, 100);
    testEncryptDecryptRandomAccess(16, 12, 512, 0, 400);
  }
Encrypt and then decrypt partially, and check that the result is the same.
java_src/src/test/java/com/google/crypto/tink/subtle/AesCtrHmacStreamingTest.java