app.py

import streamlit as st
import ast
import json
import openai
from llama_index.llms.openai import OpenAI
import nest_asyncio

nest_asyncio.apply()

# import ollama
# from llama_index.llms.ollama import Ollama
# from llama_index.core.llms import ChatMessage


# OpenAI credentials
key = os.getenv('OPENAI_API_KEY')
openai.api_key = key 
os.environ["OPENAI_API_KEY"] = key

# Streamlit UI
st.title("Auto Test Case Generation using LLM")

uploaded_files = st.file_uploader("Upload a python(.py) file", type=".py", accept_multiple_files=True)

if uploaded_files:
    for uploaded_file in uploaded_files:
        with open(f"./data/{uploaded_file.name}", 'wb') as f: 
            f.write(uploaded_file.getbuffer())
        st.success("File uploaded...")

        st.success("Fetching list of functions...")
        file_path = f"./data/{uploaded_file.name}"
        def extract_functions_from_file(file_path):
            with open(file_path, "r") as file:
                file_content = file.read()
            
            parsed_content = ast.parse(file_content)
            functions = {}
            
            for node in ast.walk(parsed_content):
                if isinstance(node, ast.FunctionDef):
                    func_name = node.name
                    func_body = ast.get_source_segment(file_content, node)
                    functions[func_name] = func_body
            
            return functions
        
        functions = extract_functions_from_file(file_path)
        list_of_functions = list(functions.keys())
        st.write(list_of_functions)

        def res(prompt):

            response = openai.chat.completions.create(
                model=model,
                messages=[
                    {"role":"system",
                     "content":"You are a helpful coding assistant. Your task is to generate test cases. If the function can't be found, politely refuse"
                    },
                    {"role": "user",
                     "content": prompt,
                    }
                ]
            )

            return response.choices[0].message.content

        # Initialize session state for chat messages
        if "messages" not in st.session_state:
            st.session_state.messages = []

         # Display chat messages from history on app rerun
        for message in st.session_state.messages:
            with st.chat_message(message["role"]):
                st.markdown(message["content"])

        # Accept user input
        if func := st.chat_input("Enter the function name for generating test cases:"):
            st.session_state.messages.append({"role": "assistant", "content": f"Generating test cases for {func}"})
            st.success(f"Generating test cases for {func}")

            func = ''.join(func.split())

            if func not in list_of_functions:
                st.write("Incorrect function name")
            
            else:
                snippet = functions[func]

                # Generation
                model = "gpt-3.5-turbo"

                # Generation
                # resp = ollama.generate(model='codellama', 
                #                     prompt=f"""You are a helpful coding assistant. Your task is to generate unit test cases for this function : {snippet}\
                #                     \n\nPolitely refuse if the function is not suitable for generating test cases.
                #                     \n\nGenerate atleast 5 unit test case. Include couple of edge cases as well.
                #                     \n\nThere should be no duplicate test cases. Avoid generating repeated statements.
                #                     """)

                prompt=f"""You are a helpful coding assistant. Your task is to generate unit test cases for this function : {snippet}\
                        \n\nPolitely refuse if the function is not suitable for generating test cases.
                       \n\nGenerate atleast 5 unit test case. Include couple of edge cases as well.
                       \n\nThere should be no duplicate test cases. Avoid generating repeated statements.
                    """

                print(prompt)
              
                resp = res(prompt)
                st.session_state.messages.append({"role": "assistant", "content": f"{resp}"})
                st.markdown(resp)
                # st.session_state.messages.append({"role": "assistant", "content": f"{resp['response']}"})
                # st.markdown(resp['response'])