### Question:
AthenaUDFHandler extends UserDefinedFunctionHandler { public String decompress(String input) { byte[] inputBytes = Base64.getDecoder().decode((input)); Inflater decompressor = new Inflater(); decompressor.setInput(inputBytes, 0, inputBytes.length); byte[] buffer = new byte[4096]; ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(inputBytes.length); try { while (!decompressor.finished()) { int bytes = decompressor.inflate(buffer); if (bytes == 0 && decompressor.needsInput()) { throw new DataFormatException("Input is truncated"); } byteArrayOutputStream.write(buffer, 0, bytes); } } catch (DataFormatException e) { throw new RuntimeException("Failed to decompress string", e); } try { byteArrayOutputStream.close(); } catch (IOException e) { throw new RuntimeException("Failed to close ByteArrayOutputStream", e); } byte[] decompressedBytes = byteArrayOutputStream.toByteArray(); return new String(decompressedBytes, StandardCharsets.UTF_8); } 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 testDecompressNull() { athenaUDFHandler.decompress(null); }
@Test(expected = IllegalArgumentException.class) public void testDecompressNonCompressedInput() { athenaUDFHandler.decompress("jklasdfkljsadflkafdsjklsdfakljadsfkjldaadfasdffsa"); }
@Test(expected = IllegalArgumentException.class) public void testDecompressBadInputEncoding() { athenaUDFHandler.decompress("78 da 0b c9 cf ab 54 70 cd 49 2d 4b 2c"); }
@Test public void testDecompressTruncatedInput() { try { athenaUDFHandler.decompress(""); } catch (RuntimeException e) { assertTrue(e.getCause() instanceof DataFormatException); assertEquals("Input is truncated", e.getCause().getMessage()); } }