Tukukkk

I have authentication service, Response and Provider(Java class) which has authentication function which are responsible to get the authenticatedToken after providing the valid username/passwords and grant_type.

Below are the Service Class which method to authenticated against external authentication service.

Public interface AuthenticationService {



     * @param username



     * @param password



     * @return



     * @throws LoginAuthenticationException



     */



   AuthenticationResponse authenticate(String username, String password) throws LoginAuthenticationException;



}

Below is the function inside the Response Class :

   @Override



        public AuthenticationResponse authenticate(String username, String password) {





                String AuthenticationRequest = GRANT_TYPE + DELIMITER_EQ + AuthConfig.getAuth().getGrantType()



                        + DELIMITER_AMP + USERNAME + DELIMITER_EQ + username



                        + DELIMITER_AMP + password + DELIMITER_EQ + password;







                HttpEntity<String> request = new HttpEntity<>(AuthenticationRequest, buildHeaders(AuthConfig.getAuth().getUsername(), AuthConfig.getAuth().getPassword()));



                ResponseEntity<AuthenticationResponse> response = restTemplate



                        .exchange(AuthConfig.getAuth().getUrl(), HttpMethod.POST, request, AuthenticationResponse.class); 

       return response.getBody();}

Below is the function inside the Provider Class to authenticate :

 @Override



    public Authentication authenticate(Authentication authentication) throws AuthenticationException {



        try {



            AuthenticationResponse AuthenticationResponse = this.AuthenticationService.authenticate((String) authentication.getPrincipal(), (String) authentication.getCredentials());



            UsernamePasswordAuthenticationToken authenticatedToken = new UsernamePasswordAuthenticationToken(authentication.getPrincipal(), null, createGrantedAuthorities(Role.ADMIN, Role.USER));



            authenticatedToken.setDetails(AuthenticationResponse);



            return authenticatedToken;



        } catch (LoginAuthenticationException ex) {



            // todo handle exceptions



            LOGGER.error(Error.UNABLE_TO_AUTHENTICATE_USER.getErrorLogEvent(), ex);



            throw ex;



        } catch (Exception ex) {



            LOGGER.error(Error.UNABLE_TO_AUTHENTICATE_USER.getErrorLogEvent(), ex);



            throw ex;



        }



    }

I'm trying to write the Unit Test for all the above three Method. below are the test file I started with .. but stuck at the staring point itself :-(

Unit Test for Function inside Service class
Public class AuthenticationServiceImpl {

@InjectMocks



AuthenticationServiceImpl AuthenticationService;







@Test



public void testAuthenticate_success() throws Exception {



    // ?????? Not sure how to start here?



}

}
Unit Test for Function inside Response class :

  @InjectMocks



    AuthenticationRepositoryImpl AuthenticationRepository;





    @Test



    public void testAuthenticate_success() throws Exception {



        // again not sure how to start here 



    }

Unit Test for Function inside Provider class :

import static org.junit.Assert.*;







@RunWith(MockitoJUnitRunner.class)



public class AuthenticationProviderTest {





    @InjectMocks



    AuthenticationProvider authenticationProvider;







    @Mock



    private AuthenticationService authenticationService;







    @Test



    public void testAuthenticate_success() throws Exception {

           AuthenticationProvider test = new authenticationProvider();

           assertEquals("True", authenticationProvider.authenticate(), ""Mix of number and A-Z/a-z);



        assertNotNull(authenticationProvider.authenticate);



         ??????????????????????????????????????????????????????????



    }



}

I know , it's become more lengthy here but I have simple doubt how to write the unit test cases of above three file (AuthenticationService, AuthenticationResponse and AuthenticationProvider)? As a new bee to Java any suggestion and help would be appreciated :-)