test: add tests for deprecated model argument handling

tests/basic/test_deprecated.py

@@ -0,0 +1,97 @@
+import os
+from unittest import TestCase
+from unittest.mock import MagicMock, patch
+
+from prompt_toolkit.input import DummyInput
+from prompt_toolkit.output import DummyOutput
+
+from aider.main import main
+from aider.deprecated import handle_deprecated_model_args
+
+
+class TestDeprecated(TestCase):
+    def setUp(self):
+        self.original_env = os.environ.copy()
+        os.environ["OPENAI_API_KEY"] = "deadbeef"
+        os.environ["AIDER_CHECK_UPDATE"] = "false"
+        os.environ["AIDER_ANALYTICS"] = "false"
+
+    def tearDown(self):
+        os.environ.clear()
+        os.environ.update(self.original_env)
+
+    @patch("aider.io.InputOutput.tool_warning")
+    def test_deprecated_args_show_warnings(self, mock_tool_warning):
+        # Test all deprecated flags to ensure they show warnings
+        deprecated_flags = [
+            "--opus", 
+            "--sonnet", 
+            "--haiku", 
+            "--4", 
+            "--4o", 
+            "--mini", 
+            "--4-turbo", 
+            "--3", 
+            "--deepseek", 
+            "--o1-mini", 
+            "--o1-preview"
+        ]
+        
+        for flag in deprecated_flags:
+            mock_tool_warning.reset_mock()
+            
+            with patch("aider.models.Model"), self.subTest(flag=flag):
+                main([flag, "--no-git", "--exit", "--yes"], input=DummyInput(), output=DummyOutput())
+                
+                mock_tool_warning.assert_called_once()
+                warning_msg = mock_tool_warning.call_args[0][0]
+                
+                # Remove any leading hyphens for the comparison
+                flag_in_msg = flag.lstrip('-')
+                
+                self.assertIn(flag_in_msg, warning_msg)
+                self.assertIn("deprecated", warning_msg)
+                self.assertIn("use --model", warning_msg.lower())
+
+    @patch("aider.io.InputOutput.tool_warning")
+    def test_model_alias_in_warning(self, mock_tool_warning):
+        # Test that the warning uses the model alias if available
+        with patch("aider.models.MODEL_ALIASES", {"gpt4": "gpt-4-0613"}):
+            with patch("aider.models.Model"):
+                main(["--4", "--no-git", "--exit", "--yes"], input=DummyInput(), output=DummyOutput())
+                
+                mock_tool_warning.assert_called_once()
+                warning_msg = mock_tool_warning.call_args[0][0]
+                self.assertIn("--model gpt4", warning_msg)
+                self.assertNotIn("--model gpt-4-0613", warning_msg)
+
+    def test_model_is_set_correctly(self):
+        test_cases = [
+            ("opus", "claude-3-opus-20240229"),
+            ("sonnet", "anthropic/claude-3-7-sonnet-20250219"),
+            ("haiku", "claude-3-5-haiku-20241022"),
+            ("4", "gpt-4-0613"),
+            ("4o", "gpt-4o"),
+            ("mini", "gpt-4o-mini"),
+            ("4_turbo", "gpt-4-1106-preview"),
+            ("35turbo", "gpt-3.5-turbo"),
+            ("deepseek", "deepseek/deepseek-chat"),
+            ("o1_mini", "o1-mini"),
+            ("o1_preview", "o1-preview"),
+        ]
+        
+        for flag, expected_model in test_cases:
+            with self.subTest(flag=flag):
+                # Create a mock IO instance
+                mock_io = MagicMock()
+                
+                # Create args with the flag set to True
+                args = MagicMock()
+                args.model = None
+                setattr(args, flag, True)
+                
+                # Call the handle_deprecated_model_args function
+                handle_deprecated_model_args(args, mock_io)
+                
+                # Check that args.model was set to the expected model
+                self.assertEqual(args.model, expected_model)