Program: 55046
Project: 55046
Buggy source:
@Before public void setup(){
  session=new AbstractSlackSessionImpl(){
    @Override public void setPresence(    SlackPersona.SlackPresence presence){
    }
    @Override public void connect(){
      SlackUser user1=new SlackUserImpl("String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str",false,false,false,false,false,false,false,"String_Node_Str","String_Node_Str",new Integer(0));
      SlackUser user2=new SlackUserImpl("String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str",false,false,false,false,false,false,false,"String_Node_Str","String_Node_Str",new Integer(0));
      SlackUser user3=new SlackUserImpl("String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str",false,false,false,false,false,false,false,"String_Node_Str","String_Node_Str",new Integer(0));
      users.put(user1.getId(),user1);
      users.put(user2.getId(),user2);
      users.put(user3.getId(),user3);
      SlackChannel channel1=new SlackChannelImpl("String_Node_Str","String_Node_Str",null,null,false);
      SlackChannel channel2=new SlackChannelImpl("String_Node_Str","String_Node_Str",null,null,false);
      SlackChannel channel3=new SlackChannelImpl("String_Node_Str","String_Node_Str",null,null,false);
      SlackChannel channel4=new SlackChannelImpl("String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str",false);
      channels.put(channel1.getId(),channel1);
      channels.put(channel2.getId(),channel2);
      channels.put(channel3.getId(),channel3);
      channels.put(channel4.getId(),channel4);
    }
    @Override public void disconnect(){
    }
    @Override public SlackMessageHandle sendMessageOverWebSocket(    SlackChannel channel,    String message){
      throw new UnsupportedOperationException();
    }
    @Override public SlackPersona.SlackPresence getPresence(    SlackPersona persona){
      return null;
    }
    @Override public SlackMessageHandle deleteMessage(    String timeStamp,    SlackChannel channel){
      return null;
    }
    @Override public SlackMessageHandle<SlackMessageReply> sendMessage(    SlackChannel channel,    SlackPreparedMessage preparedMessage,    SlackChatConfiguration chatConfiguration){
      throw new UnsupportedOperationException();
    }
    @Override public SlackMessageHandle updateMessage(    String timeStamp,    SlackChannel channel,    String message){
      return null;
    }
    @Override public SlackMessageHandle addReactionToMessage(    SlackChannel channel,    String messageTimeStamp,    String emojiCode){
      return null;
    }
    @Override public SlackMessageHandle joinChannel(    String channelName){
      return null;
    }
    @Override public SlackMessageHandle leaveChannel(    SlackChannel channel){
      return null;
    }
    @Override public SlackMessageHandle<SlackChannelReply> openDirectMessageChannel(    SlackUser user){
      return null;
    }
    @Override public SlackMessageHandle<SlackChannelReply> openMultipartyDirectMessageChannel(    SlackUser... users){
      return null;
    }
    @Override public SlackMessageHandle inviteUser(    String email,    String firstName,    boolean setActive){
      return null;
    }
    @Override public boolean isConnected(){
      return true;
    }
    @Override public SlackMessageHandle<SlackChannelReply> inviteToChannel(    SlackChannel channel,    SlackUser user){
      return null;
    }
    @Override public SlackMessageHandle sendMessageToUser(    SlackUser user,    String message,    SlackAttachment attachment){
      throw new UnsupportedOperationException("String_Node_Str");
    }
    @Override public SlackMessageHandle sendMessageToUser(    String userName,    String message,    SlackAttachment attachment){
      throw new UnsupportedOperationException("String_Node_Str");
    }
    @Override public SlackMessageHandle<GenericSlackReply> postGenericSlackCommand(    Map<String,String> params,    String command){
      return null;
    }
    @Override public SlackMessageHandle<ParsedSlackReply> archiveChannel(    SlackChannel channel){
      return null;
    }
  }
;
  try {
    session.connect();
  }
 catch (  IOException e) {
    e.printStackTrace();
  }
}

Fixed version (ground truth):
@Before public void setup(){
  session=new AbstractSlackSessionImpl(){
    @Override public long getHeartbeat(){
      return 0;
    }
    @Override public void setHeartbeat(    long heartbeat,    TimeUnit unit){
    }
    @Override public void setPresence(    SlackPersona.SlackPresence presence){
    }
    @Override public void connect(){
      SlackUser user1=new SlackUserImpl("String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str",false,false,false,false,false,false,false,"String_Node_Str","String_Node_Str",new Integer(0));
      SlackUser user2=new SlackUserImpl("String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str",false,false,false,false,false,false,false,"String_Node_Str","String_Node_Str",new Integer(0));
      SlackUser user3=new SlackUserImpl("String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str",false,false,false,false,false,false,false,"String_Node_Str","String_Node_Str",new Integer(0));
      users.put(user1.getId(),user1);
      users.put(user2.getId(),user2);
      users.put(user3.getId(),user3);
      SlackChannel channel1=new SlackChannelImpl("String_Node_Str","String_Node_Str",null,null,false);
      SlackChannel channel2=new SlackChannelImpl("String_Node_Str","String_Node_Str",null,null,false);
      SlackChannel channel3=new SlackChannelImpl("String_Node_Str","String_Node_Str",null,null,false);
      SlackChannel channel4=new SlackChannelImpl("String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str",false);
      channels.put(channel1.getId(),channel1);
      channels.put(channel2.getId(),channel2);
      channels.put(channel3.getId(),channel3);
      channels.put(channel4.getId(),channel4);
    }
    @Override public void disconnect(){
    }
    @Override public SlackMessageHandle sendMessageOverWebSocket(    SlackChannel channel,    String message){
      throw new UnsupportedOperationException();
    }
    @Override public SlackPersona.SlackPresence getPresence(    SlackPersona persona){
      return null;
    }
    @Override public SlackMessageHandle deleteMessage(    String timeStamp,    SlackChannel channel){
      return null;
    }
    @Override public SlackMessageHandle<SlackMessageReply> sendMessage(    SlackChannel channel,    SlackPreparedMessage preparedMessage,    SlackChatConfiguration chatConfiguration){
      throw new UnsupportedOperationException();
    }
    @Override public SlackMessageHandle updateMessage(    String timeStamp,    SlackChannel channel,    String message){
      return null;
    }
    @Override public SlackMessageHandle addReactionToMessage(    SlackChannel channel,    String messageTimeStamp,    String emojiCode){
      return null;
    }
    @Override public SlackMessageHandle joinChannel(    String channelName){
      return null;
    }
    @Override public SlackMessageHandle leaveChannel(    SlackChannel channel){
      return null;
    }
    @Override public SlackMessageHandle<SlackChannelReply> openDirectMessageChannel(    SlackUser user){
      return null;
    }
    @Override public SlackMessageHandle<SlackChannelReply> openMultipartyDirectMessageChannel(    SlackUser... users){
      return null;
    }
    @Override public SlackMessageHandle inviteUser(    String email,    String firstName,    boolean setActive){
      return null;
    }
    @Override public boolean isConnected(){
      return true;
    }
    @Override public SlackMessageHandle<SlackChannelReply> inviteToChannel(    SlackChannel channel,    SlackUser user){
      return null;
    }
    @Override public SlackMessageHandle sendMessageToUser(    SlackUser user,    String message,    SlackAttachment attachment){
      throw new UnsupportedOperationException("String_Node_Str");
    }
    @Override public SlackMessageHandle sendMessageToUser(    String userName,    String message,    SlackAttachment attachment){
      throw new UnsupportedOperationException("String_Node_Str");
    }
    @Override public SlackMessageHandle<GenericSlackReply> postGenericSlackCommand(    Map<String,String> params,    String command){
      return null;
    }
    @Override public SlackMessageHandle<ParsedSlackReply> archiveChannel(    SlackChannel channel){
      return null;
    }
  }
;
  try {
    session.connect();
  }
 catch (  IOException e) {
    e.printStackTrace();
  }
}