test: Add comprehensive tests for editor module functionality

tests/basic/test_editor.py

@@ -0,0 +1,128 @@
+import os
+import platform
+import pytest
+from unittest.mock import patch, MagicMock
+
+from aider.editor import (
+    get_environment_editor,
+    discover_editor,
+    write_temp_file,
+    print_status_message,
+    file_editor,
+    pipe_editor,
+    DEFAULT_EDITOR_NIX,
+    DEFAULT_EDITOR_OS_X,
+    DEFAULT_EDITOR_WINDOWS,
+)
+
+def test_get_environment_editor():
+    # Test with no environment variables set
+    with patch.dict(os.environ, {}, clear=True):
+        assert get_environment_editor("default") == "default"
+
+    # Test EDITOR precedence
+    with patch.dict(os.environ, {"EDITOR": "vim"}):
+        assert get_environment_editor() == "vim"
+
+    # Test VISUAL overrides EDITOR
+    with patch.dict(os.environ, {"EDITOR": "vim", "VISUAL": "code"}):
+        assert get_environment_editor() == "code"
+
+    # Test AIDER_EDITOR overrides all
+    with patch.dict(os.environ, {
+        "EDITOR": "vim",
+        "VISUAL": "code",
+        "AIDER_EDITOR": "emacs"
+    }):
+        assert get_environment_editor() == "emacs"
+
+def test_discover_editor():
+    with patch("platform.system") as mock_system:
+        # Test Windows default
+        mock_system.return_value = "Windows"
+        with patch.dict(os.environ, {}, clear=True):
+            assert discover_editor() == [DEFAULT_EDITOR_WINDOWS]
+
+        # Test macOS default
+        mock_system.return_value = "Darwin"
+        with patch.dict(os.environ, {}, clear=True):
+            assert discover_editor() == [DEFAULT_EDITOR_OS_X]
+
+        # Test Linux default
+        mock_system.return_value = "Linux"
+        with patch.dict(os.environ, {}, clear=True):
+            assert discover_editor() == [DEFAULT_EDITOR_NIX]
+
+    # Test editor with arguments
+    with patch.dict(os.environ, {"EDITOR": 'vim -c "set noswapfile"'}):
+        assert discover_editor() == ["vim", "-c", "set noswapfile"]
+
+    # Test invalid editor command
+    with patch.dict(os.environ, {"EDITOR": 'vim "unclosed quote'}):
+        with pytest.raises(RuntimeError):
+            discover_editor()
+
+def test_write_temp_file():
+    # Test basic file creation
+    content = "test content"
+    filepath = write_temp_file(content)
+    assert os.path.exists(filepath)
+    with open(filepath, "r") as f:
+        assert f.read() == content
+    os.remove(filepath)
+
+    # Test with suffix
+    filepath = write_temp_file("content", suffix="txt")
+    assert filepath.endswith(".txt")
+    os.remove(filepath)
+
+    # Test with prefix
+    filepath = write_temp_file("content", prefix="test_")
+    assert os.path.basename(filepath).startswith("test_")
+    os.remove(filepath)
+
+def test_print_status_message(capsys):
+    # Test success message
+    print_status_message(True, "Success!")
+    captured = capsys.readouterr()
+    assert "Success!" in captured.out
+
+    # Test failure message
+    print_status_message(False, "Failed!")
+    captured = capsys.readouterr()
+    assert "Failed!" in captured.out
+
+@patch("subprocess.call")
+def test_file_editor(mock_call):
+    # Test basic editor call
+    with patch.dict(os.environ, {"EDITOR": "vim"}):
+        file_editor("test.txt")
+        mock_call.assert_called_once_with(["vim", "test.txt"])
+
+def test_pipe_editor():
+    test_content = "Initial content"
+    modified_content = "Modified content"
+
+    # Mock the file operations and editor call
+    with patch("aider.editor.write_temp_file") as mock_write, \
+         patch("aider.editor.file_editor") as mock_editor, \
+         patch("builtins.open") as mock_open, \
+         patch("os.remove") as mock_remove:
+
+        # Setup mocks
+        mock_write.return_value = "temp.txt"
+        mock_file = MagicMock()
+        mock_file.__enter__.return_value.read.return_value = modified_content
+        mock_open.return_value = mock_file
+
+        # Test successful edit
+        result = pipe_editor(test_content)
+        assert result == modified_content
+        mock_write.assert_called_once_with(test_content, None)
+        mock_editor.assert_called_once_with("temp.txt")
+        mock_remove.assert_called_once_with("temp.txt")
+
+        # Test cleanup on permission error
+        mock_remove.side_effect = PermissionError
+        result = pipe_editor(test_content)
+        assert result == modified_content