diff --git a/tests/test_qianfan_provider.py b/tests/test_qianfan_provider.py
index d2c1d3e2..fa58dc38 100644
--- a/tests/test_qianfan_provider.py
+++ b/tests/test_qianfan_provider.py
@@ -59,6 +59,8 @@ class TestQianfanConstantsAndRouting(unittest.TestCase):
         old_plugin_path = plugins.instance.current_plugin_path
         cow_cli_was_registered = "COW_CLI" in plugins.instance.plugins
         old_cow_cli_plugin = plugins.instance.plugins.get("COW_CLI")
+        parent_had_cow_cli = hasattr(plugins, "cow_cli")
+        old_parent_cow_cli = getattr(plugins, "cow_cli", None)
         module_names = ("plugins.cow_cli", "plugins.cow_cli.cow_cli")
         old_modules = {
             name: sys.modules[name]
@@ -82,6 +84,10 @@ class TestQianfanConstantsAndRouting(unittest.TestCase):
                     sys.modules[name] = old_modules[name]
                 else:
                     sys.modules.pop(name, None)
+            if parent_had_cow_cli:
+                plugins.cow_cli = old_parent_cow_cli
+            elif hasattr(plugins, "cow_cli"):
+                delattr(plugins, "cow_cli")
 
         self.assertEqual(
             cow_cli_plugin._resolve_bot_type_for_model("ernie-4.5-turbo-128k"),