### Question:
ImapConnection { public boolean isConnected() { return inputStream != null && outputStream != null && socket != null && socket.isConnected() && !socket.isClosed(); } ImapConnection(ImapSettings settings, TrustedSocketFactory socketFactory,
            ConnectivityManager connectivityManager, OAuth2TokenProvider oauthTokenProvider);   ImapConnection(ImapSettings settings, TrustedSocketFactory socketFactory,
            ConnectivityManager connectivityManager, OAuth2TokenProvider oauthTokenProvider,
            int socketConnectTimeout, int socketReadTimeout); void open(); boolean isConnected(); void close(); OutputStream getOutputStream(); List<ImapResponse> executeSimpleCommand(String command); List<ImapResponse> executeSimpleCommand(String command, boolean sensitive); List<ImapResponse> readStatusResponse(String tag, String commandToLog, UntaggedHandler untaggedHandler); String sendSaslIrCommand(String command, String initialClientResponse, boolean sensitive); String sendCommand(String command, boolean sensitive); void sendContinuation(String continuation); ImapResponse readResponse(); ImapResponse readResponse(ImapResponseCallback callback);  }### Answer:
@Test public void isConnected_withoutPreviousOpen_shouldReturnFalse() throws Exception { ImapConnection imapConnection = createImapConnection( settings, socketFactory, connectivityManager, oAuth2TokenProvider); boolean result = imapConnection.isConnected(); assertFalse(result); }
@Test public void isConnected_afterOpen_shouldReturnTrue() throws Exception { MockImapServer server = new MockImapServer(); ImapConnection imapConnection = simpleOpen(server); boolean result = imapConnection.isConnected(); assertTrue(result); server.verifyConnectionStillOpen(); server.shutdown(); }