### Question:
AesCipher implements org.slc.sli.dal.encrypt.Cipher { @Override public Object decrypt(String data) { String[] splitData = org.apache.commons.lang3.StringUtils.split(data, ':'); if (splitData.length != 2) { return null; } else { if (splitData[0].equals("ESTRING")) { return StringUtils.newStringUtf8(decryptToBytes(splitData[1])); } else if (splitData[0].equals("EBOOL")) { return decryptBinary(splitData[1], Boolean.class); } else if (splitData[0].equals("EINT")) { return decryptBinary(splitData[1], Integer.class); } else if (splitData[0].equals("ELONG")) { return decryptBinary(splitData[1], Long.class); } else if (splitData[0].equals("EDOUBLE")) { return decryptBinary(splitData[1], Double.class); } else { return null; } } }  @Override String encrypt(Object data); @Override Object decrypt(String data);  }### Answer:
@Test() public void testUnencryptedString() { Object decrypted = aes.decrypt("Some text"); assertEquals(null, decrypted); Object d2 = aes.decrypt("SOME DATA WITH : IN IT"); assertEquals(null, d2); }