# Context:
USER: do the todo
ASSISTANT: To complete the TODO task in the `diff_partial_update` function, I will find the longest string of backticks (`) that start a line in the `diff` variable. I will then add one more backtick to the start and end of the `show` variable to ensure proper formatting.
Here are the changes:
```python
aider/diffs.py
<<<<<<< ORIGINAL
for line in diff:
pass
diff = "".join(diff)
if not diff.endswith("\n"):
diff += "\n"
show = "```diff\n"
=======
max_backticks = max(len(line) - len(line.lstrip("`")) for line in diff.splitlines())
extra_backticks = "`" * (max_backticks + 1)
diff = "".join(diff)
if not diff.endswith("\n"):
diff += "\n"
show = f"{extra_backticks}diff\n"
>>>>>>> UPDATED
```
```python
aider/diffs.py
<<<<<<< ORIGINAL
show += diff + "```\n\n"
=======
show += diff + f"{extra_backticks}\n\n"
>>>>>>> UPDATED
```
These changes will find the longest string of backticks at the start of a line in the `diff` variable and add one more backtick to the start and end of the `show` variable.
# Context:
USER: make a test for `WholeFileCoder`.updated_files
ASSISTANT: To create a test for the `WholeFileCoder`'s `update_files` method, we will add a new test function in the `tests/test_wholefile.py` file. Here's the test function:
```python
tests/test_wholefile.py
<<<<<<< ORIGINAL
=======
import os
from pathlib import Path
import tempfile
import unittest
from aider.coders.wholefile_coder import WholeFileCoder
from aider.io import InputOutput
class TestWholeFileCoder(unittest.TestCase):
def test_update_files(self):
with tempfile.TemporaryDirectory() as temp_dir:
# Create a sample file in the temporary directory
sample_file = os.path.join(temp_dir, "sample.txt")
with open(sample_file, "w") as f:
f.write("Original content\n")
# Initialize WholeFileCoder with the temporary directory
io = InputOutput()
coder = WholeFileCoder(root=temp_dir, io=io)
# Set the partial response content with the updated content
coder.partial_response_content = f"{sample_file}\n```\nUpdated content\n```"
# Call update_files method
edited_files = coder.update_files()
# Check if the sample file was updated
self.assertIn("sample.txt", edited_files)
# Check if the content of the sample file was updated
with open(sample_file, "r") as f:
updated_content = f.read()
self.assertEqual(updated_content, "Updated content\n")
if __name__ == "__main__":
unittest.main()
>>>>>>> UPDATED
```
This test function creates a temporary directory with a sample file, initializes a `WholeFileCoder` instance with the temporary directory, sets the partial response content with the updated content, calls the `update_files` method, and checks if the sample file was updated correctly.
