#fixed code
                                @Test
    public void authPlain() throws IOException {
        withConnection((printStream, reader) -> {
            // No such user
            assertThat(reader.readLine()).startsWith("+OK POP3 GreenMail Server v");
            printStream.print("AUTH PLAIN dGVzdAB0ZXN0AHRlc3RwYXNz" + CRLF /* test / test / testpass */);
            assertThat(reader.readLine()).isEqualTo("-ERR Authentication failed: User <test> doesn't exist");

            try {
                greenMail.getManagers().getUserManager()
                        .createUser("test@localhost", "test", "testpass");
            } catch (UserException e) {
                throw new IllegalStateException(e);
            }

            // Invalid pwd
            printStream.print("AUTH PLAIN dGVzdAB0ZXN0AHRlc3RwY" + CRLF /* test / test / <invalid> */);
            assertThat(reader.readLine()).isEqualTo("-ERR Authentication failed, expected base64 encoding : Last unit does not have enough valid bits");

            // Successful auth
            printStream.print("AUTH PLAIN dGVzdAB0ZXN0AHRlc3RwYXNz" + CRLF /* test / test / <invalid> */);
            assertThat(reader.readLine()).isEqualTo("+OK");
        });
    }
#vulnerable code 
                                @Test
    public void authPlain() throws IOException, MessagingException, UserException {
        try (Socket socket = new Socket(hostAddress, port)) {
            assertThat(socket.isConnected()).isTrue();
            PrintStream printStream = new PrintStream(socket.getOutputStream());
            final BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));

            // No such user
            assertThat(reader.readLine()).startsWith("+OK POP3 GreenMail Server v");
            printStream.print("AUTH PLAIN dGVzdAB0ZXN0AHRlc3RwYXNz" + CRLF /* test / test / testpass */);
            assertThat(reader.readLine()).isEqualTo("-ERR Authentication failed: User <test> doesn't exist");

            greenMail.getManagers().getUserManager().createUser("test@localhost", "test", "testpass");

            // Invalid pwd
            printStream.print("AUTH PLAIN dGVzdAB0ZXN0AHRlc3RwY" + CRLF /* test / test / <invalid> */);
            assertThat(reader.readLine()).isEqualTo(
                    "-ERR Authentication failed, expected base64 encoding : Last unit does not have enough valid bits");

            // Successful auth
            printStream.print("AUTH PLAIN dGVzdAB0ZXN0AHRlc3RwYXNz" + CRLF /* test / test / <invalid> */);
            assertThat(reader.readLine()).isEqualTo("+OK");
        }
    } 
                            #location 3 
                            #vulnerability type RESOURCE_LEAK