add user info testing feature

app.py

@@ -112,5 +112,13 @@ with gr.Blocks(theme=seafoam, css=css) as demo:
     with gr.Row():
         f = gr.HTML(html, label="Achievement Log", elem_id="achievement_log")
 
+    with gr.Row():
+        input = gr.Textbox(elem_id='user_id')
+        output = gr.Textbox()
+
+    def print_text():
+        return "Yes, babe!"
+    input.change(print_text, None, output)
+
 if __name__ == "__main__":
     demo.launch()