assertThrows(IndexOutOfBoundsException.class, () -> hasher.putBytes(new byte[8], 0, -1));
  }

  private static final class TestHasher extends AbstractByteHasher {

    private final ByteArrayOutputStream out = new ByteArrayOutputStream();

    @Override
    protected void update(byte b) {
      out.write(b);
    }

    @Override
    protected void update(byte[] b, int off, int len) {

        this.mechanism = mechanism;
    }

    @Override
    public byte[] toByteArray() {
        try {
            final ByteArrayOutputStream collector = new ByteArrayOutputStream();
            final ASN1OutputStream der = ASN1OutputStream.create(collector, ASN1Encoding.DER);
            final ASN1EncodableVector fields = new ASN1EncodableVector();

                }
            });
        }

        void checkVersion(Project project, String tool, Pattern versionRegex, int... minVersion) {
            ByteArrayOutputStream pipe = new ByteArrayOutputStream();
            project.exec(spec -> {
                spec.setCommandLine(tool, "--version");
                spec.setStandardOutput(pipe);
            });

    }

    private static String readFully(InputStream inputStream) throws IOException {
        try (InputStream input = inputStream; ByteArrayOutputStream out = new ByteArrayOutputStream()) {
            byte[] buf = new byte[8192];
            int read;
            while ((read = input.read(buf)) >= 0) {
                out.write(buf, 0, read);
            }

    static String srcString = "ABCDEFGHIJKLMN";

    static String urlString = "あいうえお";

    InputStream is = new ByteArrayInputStream(srcBytes);

    ByteArrayOutputStream os = new ByteArrayOutputStream();

    Reader reader = new StringReader(srcString);

    StringWriter writer = new StringWriter();

    StringBuilder builder = new StringBuilder();

        int code = p.waitFor();
        return new ExecResult(code, out, err);
    }

    private static String readFully(InputStream in) throws IOException {
        try (InputStream input = in; ByteArrayOutputStream out = new ByteArrayOutputStream()) {
            byte[] buf = new byte[8192];
            int read;
            while ((read = input.read(buf)) >= 0) {
                out.write(buf, 0, read);
            }

        }
    }

    @Test
    public void test_main_withHelp() {
        // Test main method with help option
        PrintStream originalErr = System.err;
        try {
            ByteArrayOutputStream errContent = new ByteArrayOutputStream();
            System.setErr(new PrintStream(errContent));

            String[] args = { "--help" };
            // Note: main calls System.exit, so we can't test it directly

        sink.assertBytes(expected);
      }
    }
  }

  private static class Sink extends AbstractStreamingHasher {
    final int chunkSize;
    final int bufferSize;
    final ByteArrayOutputStream out = new ByteArrayOutputStream();

    int processCalled = 0;
    boolean remainingCalled = false;

    Sink(int chunkSize, int bufferSize) {
      super(chunkSize, bufferSize);
      this.chunkSize = chunkSize;

            final ASN1EncodableVector ev = new ASN1EncodableVector();
            ev.add(SPNEGO_OID);
            ev.add(new DERTaggedObject(true, 0, new DERSequence(fields)));
            final ByteArrayOutputStream collector = new ByteArrayOutputStream();
            final ASN1OutputStream der = ASN1OutputStream.create(collector, ASN1Encoding.DER);

    assertThat(result.get(result.size() - 1)).isEqualTo("THE END");
  }

  public void testCopyToOutputStream() throws IOException {
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    URL resource = getClass().getResource("testdata/i18n.txt");
    Resources.copy(resource, out);
    assertThat(out.toString("UTF-8")).isEqualTo(I18N);
  }