diff --git a/tests/unit/pkgmgr/actions/install/installers/os_packages/test_debian_control.py b/tests/unit/pkgmgr/actions/install/installers/os_packages/test_debian_control.py
index a6a07a8..199f42a 100644
--- a/tests/unit/pkgmgr/actions/install/installers/os_packages/test_debian_control.py
+++ b/tests/unit/pkgmgr/actions/install/installers/os_packages/test_debian_control.py
@@ -72,6 +72,8 @@ class TestDebianControlInstaller(unittest.TestCase):
                 return "/usr/bin/dpkg-buildpackage"
             if name == "apt-get":
                 return "/usr/bin/apt-get"
+            if name == "sudo":
+                return "/usr/bin/sudo"
             return None
 
         mock_which.side_effect = which_side_effect
diff --git a/tests/unit/pkgmgr/core/config/test_cli_update.py b/tests/unit/pkgmgr/core/config/test_cli_update.py
index c535ede..ed1a5bc 100644
--- a/tests/unit/pkgmgr/core/config/test_cli_update.py
+++ b/tests/unit/pkgmgr/core/config/test_cli_update.py
@@ -29,22 +29,19 @@ class FindDefaultsSourceDirTests(unittest.TestCase):
 
             self.assertEqual(Path(found).resolve(), (pkg_root / "config").resolve())
 
-    def test_falls_back_to_project_root_config(self):
+    def test_a_config_dir_beside_the_package_is_not_taken(self):
         with tempfile.TemporaryDirectory() as td:
             root = Path(td)
             pkg_root = root / "site-packages" / "pkgmgr"
             pkg_root.mkdir(parents=True)
 
-            # only project_root config exists
             (pkg_root.parent / "config").mkdir(parents=True)
 
             fake_pkgmgr = types.SimpleNamespace(__file__=str(pkg_root / "__init__.py"))
             with patch.dict(sys.modules, {"pkgmgr": fake_pkgmgr}):
                 found = config_cmd._find_defaults_source_dir()
 
-            self.assertEqual(
-                Path(found).resolve(), (pkg_root.parent / "config").resolve()
-            )
+            self.assertIsNone(found)
 
     def test_returns_none_when_no_config_dirs_exist(self):
         with tempfile.TemporaryDirectory() as td:
@@ -88,9 +85,8 @@ class UpdateDefaultConfigsTests(unittest.TestCase):
             self.assertTrue((dest_cfg_dir / "a.yaml").is_file())
             self.assertTrue((dest_cfg_dir / "b.yml").is_file())
             self.assertFalse(
-                (dest_cfg_dir / "config.yaml")
-                .read_text(encoding="utf-8")
-                .startswith("should_not_copy")
+                (dest_cfg_dir / "config.yaml").exists(),
+                "the source config.yaml must not be copied over the user's own",
             )
 
             # Ensure config.yaml was not overwritten (it may exist, but should remain original if we create it)
diff --git a/tests/unit/pkgmgr/core/config/test_load.py b/tests/unit/pkgmgr/core/config/test_load.py
index 8bb3c25..4ff0198 100644
--- a/tests/unit/pkgmgr/core/config/test_load.py
+++ b/tests/unit/pkgmgr/core/config/test_load.py
@@ -242,9 +242,7 @@ class LoadConfigIntegrationUnitTests(unittest.TestCase):
             # Provide package defaults via fake pkgmgr + pkg_root/config
             root = Path(td) / "site-packages"
             pkg_root = root / "pkgmgr"
-            cfg_dir = (
-                root / "config"
-            )  # NOTE: load.py checks multiple roots, including pkg_root.parent (=site-packages)
+            cfg_dir = pkg_root / "config"
             pkg_root.mkdir(parents=True)
             cfg_dir.mkdir(parents=True)