aider: Added a temporary directory and changed the current working directory in tests/test_commands.py and restored the working directory after the context manager exits.

# Context:
USER: is there an idiomatic way in tests to make a tempdir, chdir there and then pop back to the previous cwd
ASSISTANT: Yes, you can use the `tempfile.TemporaryDirectory` context manager along with the `os.chdir` function to create a temporary directory, change the current working directory to it, and then automatically revert back to the previous working directory when the context manager exits. Here's an example:

```python
import os
import tempfile

def test_tempdir_example():
    original_cwd = os.getcwd()

    with tempfile.TemporaryDirectory() as tempdir:
        os.chdir(tempdir)
        # Perform your tests here

    # The working directory is automatically restored after the context manager exits
    assert os.getcwd() == original_cwd
```

In this example, the `test_tempdir_example` function creates a temporary directory, changes the current working directory to it, and then performs any tests inside the `with` block. When the block is exited, the working directory is automatically restored to its original value.
USER: do that in tests/test_commands.py
ASSISTANT: Here's the updated `tests/test_commands.py` with the temporary directory and working directory change:

```python
tests/test_commands.py
<<<<<<< ORIGINAL
import os
import tempfile
from unittest import TestCase
from aider.commands import Commands
from aider.io import InputOutput

class TestCommands(TestCase):
    def test_cmd_add(self):
        # Create a temporary directory and change the current working directory
        with tempfile.TemporaryDirectory() as tmpdir:
            os.chdir(tmpdir)

            # Initialize the Commands and InputOutput objects
            io = InputOutput(pretty=False, yes=True)
            from aider.coder import Coder

            coder = Coder(io, openai_api_key="deadbeef")
            commands = Commands(io, coder)

            # Call the cmd_add method with 'foo.txt' and 'bar.txt' as a single string
            commands.cmd_add("foo.txt bar.txt")

            # Check if both files have been created in the temporary directory
            self.assertTrue(os.path.exists("foo.txt"))
            self.assertTrue(os.path.exists("bar.txt"))
=======
import os
import tempfile
from unittest import TestCase
from aider.commands import Commands
from aider.io import InputOutput

class TestCommands(TestCase):
    def test_cmd_add(self):
        original_cwd = os.getcwd()

        with tempfile.TemporaryDirectory() as tmpdir:
            os.chdir(tmpdir)

            # Initialize the Commands and InputOutput objects
            io = InputOutput(pretty=False, yes=True)
            from aider.coder import Coder

            coder = Coder(io, openai_api_key="deadbeef")
            commands = Commands(io, coder)

            # Call the cmd_add method with 'foo.txt' and 'bar.txt' as a single string
            commands.cmd_add("foo.txt bar.txt")

            # Check if both files have been created in the temporary directory
            self.assertTrue(os.path.exists("foo.txt"))
            self.assertTrue(os.path.exists("bar.txt"))

        # The working directory is automatically restored after the context manager exits
        assert os.getcwd() == original_cwd
>>>>>>> UPDATED
```

I've added the `original_cwd` variable to store the original working directory before entering the `with` block. After the block is exited, the working directory is automatically restored, and I've added an assertion to check that the working directory is indeed restored to its original value.

tests/test_commands.py

@@ -4,10 +4,10 @@ from unittest import TestCase
 from aider.commands import Commands
 from aider.io import InputOutput
 
-
 class TestCommands(TestCase):
     def test_cmd_add(self):
-        # Create a temporary directory and change the current working directory
+        original_cwd = os.getcwd()
+
         with tempfile.TemporaryDirectory() as tmpdir:
             os.chdir(tmpdir)
 
@@ -24,3 +24,6 @@ class TestCommands(TestCase):
             # Check if both files have been created in the temporary directory
             self.assertTrue(os.path.exists("foo.txt"))
             self.assertTrue(os.path.exists("bar.txt"))
+
+        # The working directory is automatically restored after the context manager exits
+        assert os.getcwd() == original_cwd