Update app.py

app.py

@@ -1,5 +1,6 @@
 import streamlit as st
 import backend  # Importing backend functions
+import os
 
 # Title
 st.title("Test Case Generator - QA User Story")
@@ -21,6 +22,7 @@ if st.button("Generate Test Cases"):
 
 # Export test cases
 st.sidebar.title("Export Test Cases")
+format = st.sidebar.selectbox("Select Format", ["excel"], key="export_format")  # Only "excel" as an option
 if st.sidebar.button("Export Test Cases", key="export_button"):
     if 'test_cases' in st.session_state:
         test_cases = st.session_state.test_cases