aider: Added a test method test_cmd_add that creates a temporary directory, calls the cmd_add method with 'foo.txt' and 'bar.txt', and checks if both files have been created in the temporary directory.

# Context:
USER: add a test for cmd_add that passes in 'foo.txt' and 'bar.txt' and ensures they have both been created after the test. run the test in a tmp dir.
ASSISTANT: I will add a new test method called `test_cmd_add` in the `tests/test_commands.py` file. This test will create a temporary directory, change the current working directory to the temporary directory, and then call the `cmd_add` method with 'foo.txt' and 'bar.txt' as arguments. After that, it will check if both files have been created in the temporary directory.

Here's the code change:

```python
tests/test_commands.py
<<<<<<< ORIGINAL
=======
import os
import tempfile
from unittest import TestCase
from unittest.mock import MagicMock
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)
            coder = MagicMock()
            commands = Commands(io, coder)

            # Call the cmd_add method with 'foo.txt' and 'bar.txt'
            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"))
>>>>>>> UPDATED
```

This test will ensure that the `cmd_add` method creates the specified files in the current working directory.

tests/test_commands.py

@@ -0,0 +1,24 @@
+import os
+import tempfile
+from unittest import TestCase
+from unittest.mock import MagicMock
+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)
+            coder = MagicMock()
+            commands = Commands(io, coder)
+
+            # Call the cmd_add method with 'foo.txt' and 'bar.txt'
+            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"))