FINAL DOCKERFIX: Ensuring Dockerfile copies pdf_utils.py instead of the nonexistent main.py.

app.py

@@ -76,15 +76,12 @@ else:
 
     st.divider()
 
-    if st.session_state.get("pdf_bytes"):
-        st.success("PDF ready")
-        st.download_button(
-            label="📥 Download Test Cases PDF",
-            data=st.session_state["pdf_bytes"],
-            file_name="test_cases.pdf",
-            mime="application/pdf",
-            key="download_pdf"
-        )
+    with st.spinner("📄 Generating test cases PDF..."):
+        st.session_state.pdf_bytes = test_case(
+        st.session_state.generated_code
+    )
+
+    st.success("✅ Test cases PDF generated")