aider: Added assertion to check if repo.iter_commits(repo.active_branch.name) raises git.exc.GitCommandError.

# Aider chat conversation:

ASSISTANT: I understand that you want to complete the TODO task in the `test_new_file_edit_one_commit` method in the `tests/test_coder.py` file. However, the task is not clear. The TODO comment says:

```python
### TODO: assert that the next line raises git.exc.GitCommandError
```

This suggests that the following line of code should raise a `git.exc.GitCommandError` exception:

```python
repo.iter_commits(repo.active_branch.name)
```

To complete this task, we need to add a test assertion that checks if this line of code raises the `git.exc.GitCommandError` exception. We can use the `assertRaises` method from the `unittest.TestCase` class to do this.

Here is the change that needs to be made:

<source>python
tests/test_coder.py
<<<<<<< HEAD
            ### TODO: assert that the next line raises git.exc.GitCommandError
            repo.iter_commits(repo.active_branch.name)
=======
            with self.assertRaises(git.exc.GitCommandError):
                repo.iter_commits(repo.active_branch.name)
>>>>>>> updated
</source>

This change will add an assertion that checks if the `repo.iter_commits(repo.active_branch.name)` line of code raises a `git.exc.GitCommandError` exception. If the line of code does not raise this exception, the test will fail.

tests/test_coder.py

@@ -382,8 +382,8 @@ class TestCoder(unittest.TestCase):
 
             self.assertTrue(fname.exists())
 
-            ### TODO: assert that the next line raises git.exc.GitCommandError
-            repo.iter_commits(repo.active_branch.name)
+            with self.assertRaises(git.exc.GitCommandError):
+                repo.iter_commits(repo.active_branch.name)
 
             def mock_send(*args, **kwargs):
                 coder.partial_response_content = f"""