feat(client): initialize procurement tool skeleton

client/tests/test_app.py

@@ -0,0 +1,24 @@
+"""验证桌面入口的纯参数处理，不启动 PySide6。"""
+
+from __future__ import annotations
+
+import sys
+from pathlib import Path
+import unittest
+from unittest import mock
+
+
+CLIENT_ROOT = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(CLIENT_ROOT / "src"))
+
+from cmbuyer_client.app import select_application_argv
+
+
+class ApplicationArgumentsTests(unittest.TestCase):
+    def test_empty_argument_list_is_not_replaced_with_process_arguments(self) -> None:
+        with mock.patch("cmbuyer_client.app.sys.argv", ["process-name", "--process-option"]):
+            self.assertEqual([], select_application_argv([]))
+
+    def test_none_uses_process_arguments(self) -> None:
+        with mock.patch("cmbuyer_client.app.sys.argv", ["process-name", "--process-option"]):
+            self.assertEqual(["process-name", "--process-option"], select_application_argv(None))