### Question:
RSAencryptionUtil { public RSAPrivateKey getPrivateKey(Map<String, Object> keyMap){ RSAPrivateKey privateKey = (RSAPrivateKey) keyMap.get(HelperHolder.PRIVATE_KEY); return privateKey; } private  RSAencryptionUtil(); static RSAencryptionUtil getInstance(); Map<String, Object> initKey(); RSAPublicKey getpublicKey(Map<String, Object> keyMap); RSAPrivateKey getPrivateKey(Map<String, Object> keyMap); byte[] encrypt(byte[] data, RSAPublicKey publicKey); byte[] decrypt(byte[] data, RSAPrivateKey privateKey);  }### Answer:
@Test void getPrivateKey() { }