@Theory
  public void testSkipWithStream(
      @FromDataPoints("skipWithStreamTestVectors") AesGcmHkdfStreamingTestVector t)
      throws Exception {
    StreamingTestUtil.testSkipWithStream(
        t.directConstructorAgs,
        t.directConstructorAgs.getFirstSegmentOffset(),
        t.plaintextSize,
        t.chunkSize);
  }
Encrypt and then decrypt partially, and check that the result is the same.
java_src/src/test/java/com/google/crypto/tink/subtle/AesGcmHkdfStreamingTest.java