fix(test): import mirror submodules before patching in integration tests

Ensure pkgmgr.actions.mirror.* submodules are imported before unittest.mock.patch
to avoid AttributeError when patching dotted paths (e.g. check_cmd).
Stabilizes mirror CLI integration tests in CI.

https://chatgpt.com/share/693ed9f5-9918-800f-a880-d1238b3da1c9

tests/integration/test_mirror_commands.py

@@ -15,6 +15,7 @@ are patched to keep tests deterministic and CI-safe.
 
 from __future__ import annotations
 
+import importlib
 import io
 import os
 import runpy
@@ -56,8 +57,18 @@ class TestIntegrationMirrorCommands(unittest.TestCase):
             }
         )
 
-        # Helper: patch with create=True so missing modules/symbols don't explode
+        # Helper: patch with create=True so missing symbols don't explode.
+        # IMPORTANT: patch() does not auto-import submodules when resolving dotted names.
+        # Example failure: AttributeError: pkgmgr.actions.mirror has no attribute 'check_cmd'
+        # → so we import the parent module first (if it exists).
         def _p(target: str, **kwargs):
+            module_name = target.rsplit(".", 1)[0]
+            try:
+                importlib.import_module(module_name)
+            except ModuleNotFoundError:
+                # If the module truly doesn't exist, create=True may still allow patching
+                # in some cases, but dotted resolution can still fail. Best-effort.
+                pass
             return patch(target, create=True, **kwargs)
 
         # Fake result for remote provisioning (preview-safe)
@@ -114,7 +125,6 @@ class TestIntegrationMirrorCommands(unittest.TestCase):
                                 % (cmd_repr, exc.code, buffer.getvalue())
                             )
 
-
             return buffer.getvalue()
 
         finally: