code: def test_gpt_assistant_chat():
      ossinsight_api_schema = {
          "name": "ossinsight_data_api",
          "parameters": {
              "type": "object",
              "properties": {
                  "question": {
                      "type": "string",
                      "description": "Enter your GitHub data question in the form of a clear and specific question to ensure the returned data is accurate and valuable. For optimal results, specify the desired format for the data table in your request.",
                  }
              },
              "required": ["question"],
          },
          "description": "This is an API endpoint allowing users (analysts) to input question about GitHub in text format to retrieve the related and structured data.",
      }
  
      name = "For test_gpt_assistant_chat"
      analyst = GPTAssistantAgent(
          name=name,
          llm_config={
              "tools": [
                  {
                      "type": "function",
                      "function": ossinsight_api_schema,
                  }
              ],
              "config_list": config_list,
          },
          instructions="Hello, Open Source Project Analyst. You'll conduct comprehensive evaluations of open source projects or organizations on the GitHub platform",
      )
      analyst.register_function(
          function_map={
              "ossinsight_data_api": ask_ossinsight,
          }
      )
  
      ok, response = analyst._invoke_assistant(
          [
              {
                  "role": "user",
                  "content": "What is the most popular open source project on GitHub?",
              }
          ]
      )
      executable = analyst.can_execute_function("ossinsight_data_api")
      analyst.reset()
      threads_count = len(analyst._openai_threads)
      analyst.delete_assistant()
  
      assert ok is True
      assert response.get("role", "") == "assistant"
      assert len(response.get("content", "")) > 0
      assert executable is False
      assert threads_count == 0
  
file_path: autogen/test/agentchat/contrib/test_gpt_assistant.py
imports: import pytest
  import os
  import sys
  import autogen
  from autogen import OpenAIWrapper
  from conftest import skip_openai
  from test_assistant_agent import KEY_LOC, OAI_CONFIG_LIST
label_desc: Use image node_id 2 for calling a global function with example usage: test_gpt_assistant_chat() without return types