Update test_outline.py

Author: yvan-sraka

tests/test_outline.py

@@ -16,9 +16,9 @@ def template(a: int) -> str:
 
 def test_outline():
     mock_model = Mock()
-    mock_model.__iter__ = lambda self: iter([])
+    mock_model.vocabulary.__iter__ = lambda self: iter([])
     mock_generator = Mock()
-    mock_generator.__iter__ = lambda self: iter([])
+    mock_generator.vocabulary.__iter__ = lambda self: iter([])
     mock_generator.return_value = '{"result": 6}'
     with patch("outlines.generate.json", return_value=mock_generator):
         outline_instance = Outline(mock_model, template, OutputModel)