aider: Replaced MagicMock with custom mock_send function to set partial_response_content and return False in test_get_commit_message.

# Context:
USER: and test_get_commit_message
ASSISTANT: To make the requested change, modify the `test_get_commit_message` method in the `tests/test_coder.py` file as follows:

```python
tests/test_coder.py
<<<<<<< ORIGINAL
        # Mock the send method to return a tuple with a message and False
        coder.send = MagicMock(return_value=("a good commit message", False))
=======
        # Mock the send method to set partial_response_content and return False
        def mock_send(*args, **kwargs):
            coder.partial_response_content = "a good commit message"
            return False

        coder.send = MagicMock(side_effect=mock_send)
>>>>>>> UPDATED
```

This will replace the original `MagicMock` with a custom `mock_send` function that sets `coder.partial_response_content` to the desired commit message and returns `False`.

tests/test_coder.py

@@ -80,8 +80,12 @@ class TestCoder(unittest.TestCase):
         # Initialize the Coder object with the mocked IO and mocked repo
         coder = Coder.create(models.GPT4, None, mock_io, openai_api_key="fake_key")
 
-        # Mock the send method to return a tuple with a message and False
-        coder.send = MagicMock(return_value=("a good commit message", False))
+        # Mock the send method to set partial_response_content and return False
+        def mock_send(*args, **kwargs):
+            coder.partial_response_content = "a good commit message"
+            return False
+
+        coder.send = MagicMock(side_effect=mock_send)
 
         # Call the get_commit_message method with dummy diff and context
         result = coder.get_commit_message("dummy diff", "dummy context")