### Question:
BasicAuthenticator implements Authenticator { @Override public AuthenticationResponse authenticate(AuthenticationRequest authnRequest) throws AuthenticationException { return impl.authenticate(authnRequest); } BasicAuthenticator(String type);  BasicAuthenticator(); @Override void initialize(); @Override AuthenticationResponse authenticate(AuthenticationRequest authnRequest); @Override String getAuthenticationMethod(); @Override List<String> getRequiredCredentials();  }### Answer:
@Test public void authenticateTest() throws Exception { Authenticator auth = new BasicAuthenticator(); List<CredentialType> credentials = new ArrayList<CredentialType>(); CredentialType subject = new CredentialType(); subject.setName("userid"); subject.setValue("jdoe"); credentials.add(subject); CredentialType password = new CredentialType(); password.setName("password"); password.setValue("secret"); credentials.add(password); AuthenticationRequest request = new AuthenticationRequest(); request.setCredentials(credentials); AuthenticationResponse response = auth.authenticate(request); assertNotNull(response); assertEquals("BASIC", response.getAuthenticationMethod()); assertEquals("jdoe", response.getAuthnSubject("USER").getValue()); assertEquals(2, response.getSubjectGroups().size()); }