e:\Git\Final_Assignment_Template\.venv\Scripts\python.exe : 
USER_AGENT environment variable not set, consider setting 
it to identify your requests.
At line:1 char:1
+ e:\Git\Final_Assignment_Template\.venv\Scripts\python.exe 
e:\Git\Fina ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (USER_AGENT env 
   i... your requests.:String) [], RemoteException
    + FullyQualifiedErrorId : NativeCommandError
 
Traceback (most recent call last):
  File "C:\Users\Admin\AppData\Roaming\uv\python\cpython-3.1
2.12-windows-x86_64-none\Lib\unittest\mock.py", line 1581, 
in __enter__
    setattr(self.target, self.attribute, new_attr)
  File "E:\Git\Final_Assignment_Template\.venv\Lib\site-pack
ages\pydantic\main.py", line 1032, in __setattr__
    elif (setattr_handler := self._setattr_handler(name, 
value)) is not None:
                             
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "E:\Git\Final_Assignment_Template\.venv\Lib\site-pack
ages\pydantic\main.py", line 1079, in _setattr_handler
    raise ValueError(f'"{cls.__name__}" object has no field 
"{name}"')
ValueError: "ChatOpenAI" object has no field "invoke"

During handling of the above exception, another exception 
occurred:

Traceback (most recent call last):
  File "E:\Git\Final_Assignment_Template\.venv\Lib\site-pack
ages\pydantic\main.py", line 1119, in __delattr__
    object.__delattr__(self, item)
AttributeError: 'ChatOpenAI' object has no attribute 
'invoke'

During handling of the above exception, another exception 
occurred:

Traceback (most recent call last):
  File 
"e:\Git\Final_Assignment_Template\verify_fallback.py", line 
62, in <module>
    test_fallback_logic()
  File 
"e:\Git\Final_Assignment_Template\verify_fallback.py", line 
28, in test_fallback_logic
    with patch('agent.openrouter_model.invoke') as 
mock_openrouter, \
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Admin\AppData\Roaming\uv\python\cpython-3.1
2.12-windows-x86_64-none\Lib\unittest\mock.py", line 1594, 
in __enter__
    if not self.__exit__(*sys.exc_info()):
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Admin\AppData\Roaming\uv\python\cpython-3.1
2.12-windows-x86_64-none\Lib\unittest\mock.py", line 1605, 
in __exit__
    delattr(self.target, self.attribute)
  File "E:\Git\Final_Assignment_Template\.venv\Lib\site-pack
ages\pydantic\main.py", line 1121, in __delattr__
    raise AttributeError(f'{type(self).__name__!r} object 
has no attribute {item!r}')
AttributeError: 'ChatOpenAI' object has no attribute 
'invoke'
Testing fallback logic...
Test failed: 'ChatOpenAI' object has no attribute 'invoke'