[Feature] add cli command serve (#4226)

tests/entrypoints/cli/test_serve.py

@@ -0,0 +1,46 @@
+import argparse
+import unittest
+from unittest.mock import MagicMock, patch
+
+from fastdeploy.entrypoints.cli.serve import ServeSubcommand, cmd_init
+
+
+class TestServeSubcommand(unittest.TestCase):
+    """Tests for ServeSubcommand class."""
+
+    def test_name_property(self):
+        """Test the name property is correctly set."""
+        self.assertEqual(ServeSubcommand.name, "serve")
+
+    @patch("subprocess.Popen", return_value=MagicMock())
+    def test_cmd_method(self, mock_subprocess):
+        """Test the cmd method calls the expected API server functions."""
+        test_args = argparse.Namespace(port=8000)
+        mock_subprocess.return_value.pid = 1
+        ServeSubcommand.cmd(test_args)
+        mock_subprocess.assert_called_once()
+
+    def test_validate_method(self):
+        """Test the validate method does nothing (no-op)."""
+        test_args = argparse.Namespace()
+        instance = ServeSubcommand()
+        instance.validate(test_args)  # Should not raise any exceptions
+
+    @patch("argparse._SubParsersAction.add_parser")
+    def test_subparser_init(self, mock_add_parser):
+        """Test the subparser initialization."""
+        mock_subparsers = MagicMock()
+        instance = ServeSubcommand()
+        result = instance.subparser_init(mock_subparsers)
+        self.assertIsNotNone(result)
+
+    def test_cmd_init_returns_list(self):
+        """Test cmd_init returns a list of subcommands."""
+        result = cmd_init()
+        self.assertIsInstance(result, list)
+        self.assertEqual(len(result), 1)
+        self.assertIsInstance(result[0], ServeSubcommand)
+
+
+if __name__ == "__main__":
+    unittest.main()