### Question:
AthenaUDFHandler extends UserDefinedFunctionHandler { public String compress(String input) { byte[] inputBytes = input.getBytes(StandardCharsets.UTF_8); Deflater compressor = new Deflater(); compressor.setInput(inputBytes); compressor.finish(); byte[] buffer = new byte[4096]; ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(inputBytes.length); while (!compressor.finished()) { int bytes = compressor.deflate(buffer); byteArrayOutputStream.write(buffer, 0, bytes); } try { byteArrayOutputStream.close(); } catch (IOException e) { throw new RuntimeException("Failed to close ByteArrayOutputStream", e); } byte[] compressedBytes = byteArrayOutputStream.toByteArray(); return Base64.getEncoder().encodeToString(compressedBytes); } AthenaUDFHandler(); @VisibleForTesting  AthenaUDFHandler(CachableSecretsManager cachableSecretsManager); String compress(String input); String decompress(String input); String decrypt(String ciphertext, String secretName); String encrypt(String plaintext, String secretName);  }### Answer:
@Test(expected = NullPointerException.class) public void testCompressNull() { athenaUDFHandler.compress(null); }