Fix tests

app.py

@@ -58,6 +58,9 @@ def download_leaderboard() -> pd.DataFrame:
         raise ValueError("No content or download_url found in API response")
 
     df = pd.read_csv(io.StringIO(csv_content))
+    if df.empty:
+        return df
+
     missing_cols = [col for col in DISPLAY_COLUMNS if col not in df.columns]
     if missing_cols:
         raise ValueError(f"Leaderboard is missing expected columns: {', '.join(missing_cols)}")
@@ -81,27 +84,34 @@ def refresh_leaderboard():
     return df, status
 
 
-with gr.Blocks(title="Upgini MLE-Bench Leaderboard") as demo:
-    gr.Markdown(
-        """
-        # Upgini MLE-Bench Tabular Leaderboard
+def create_app():
+    """Create and configure the Gradio app without launching it."""
+    with gr.Blocks(title="Upgini MLE-Bench Leaderboard") as demo:
+        gr.Markdown(
+            """
+            # Upgini MLE-Bench Tabular Leaderboard
 
-        This app mirrors the remote leaderboard so you always see the latest public results.
-        Click **Refresh leaderboard** any time to re-download the CSV from GitHub.
-        """
-    )
+            This app mirrors the remote leaderboard so you always see the latest public results.
+            Click **Refresh leaderboard** any time to re-download the CSV from GitHub.
+            """
+        )
 
-    leaderboard_table = gr.DataFrame(
-        value=pd.DataFrame(columns=DISPLAY_COLUMNS),
-        wrap=True,
-        interactive=False,
-        type="pandas",
-        label="Leaderboard",
-    )
-    status_text = gr.Markdown()
-    refresh_button = gr.Button("Refresh leaderboard", variant="primary")
+        leaderboard_table = gr.DataFrame(
+            value=pd.DataFrame(columns=DISPLAY_COLUMNS),
+            wrap=True,
+            interactive=False,
+            type="pandas",
+            label="Leaderboard",
+        )
+        status_text = gr.Markdown()
+        refresh_button = gr.Button("Refresh leaderboard", variant="primary")
+
+        demo.load(refresh_leaderboard, outputs=[leaderboard_table, status_text])
+        refresh_button.click(refresh_leaderboard, outputs=[leaderboard_table, status_text])
+
+    return demo
 
-    demo.load(refresh_leaderboard, outputs=[leaderboard_table, status_text])
-    refresh_button.click(refresh_leaderboard, outputs=[leaderboard_table, status_text])
 
-demo.queue(default_concurrency_limit=8).launch()
+if __name__ == "__main__":
+    demo = create_app()
+    demo.queue(default_concurrency_limit=8).launch()