Add a test case for ChatInterface.title

Author: whitphx

test/test_chat_interface.py

@@ -41,6 +41,10 @@ def echo_system_prompt_plus_message(message, history, system_prompt, tokens):
 
 
 class TestInit:
+    def test_default_title(self):
+        chat = gr.ChatInterface(double)
+        assert chat.title == "Gradio"
+
     def test_no_fn(self):
         with pytest.raises(TypeError):
             gr.ChatInterface()  # type: ignore