Fix: Add assertions to minimal demo

test_minimal.py

@@ -11,18 +11,27 @@ IS_SPACES = (
     os.getenv("HF_SPACE_ID") is not None
 )
 
-# Create a minimal demo
+# Create a minimal demo - CRITICAL: demo must be at module level
 with gr.Blocks(title="Test Demo") as demo:
-    gr.Markdown("# Test Demo")
-    gr.Markdown("If you see this, Gradio is working!")
-    text_input = gr.Textbox(label="Test Input")
-    text_output = gr.Textbox(label="Test Output")
+    gr.Markdown("# ✅ Test Demo - Gradio is Working!")
+    gr.Markdown("If you see this message, Gradio is working correctly on Spaces!")
+    
+    text_input = gr.Textbox(label="Test Input", placeholder="Type something here...")
+    text_output = gr.Textbox(label="Test Output", interactive=False)
     
     def echo(text):
+        if not text:
+            return "Please enter some text"
         return f"You said: {text}"
     
     text_input.submit(echo, inputs=text_input, outputs=text_output)
 
+# CRITICAL: Ensure demo is accessible
 print(f"Demo created: {type(demo)}")
 print(f"IS_SPACES: {IS_SPACES}")
+print(f"Demo is valid: {isinstance(demo, (gr.Blocks, gr.Interface))}")
+
+# Explicitly verify demo exists
+assert demo is not None, "Demo must not be None"
+assert isinstance(demo, (gr.Blocks, gr.Interface)), f"Demo must be Gradio object, got {type(demo)}"