test: fix runit missing-script fixture

tests/test_init_system.py

@@ -685,11 +685,19 @@ class TestEdgeCases:
 
     def test_runit_collect_missing_script(self):
         """Runit collect exits when fenris-collect script not found."""
-        with patch("fenris.init_system.Path") as mock_path:
-            mock_path.return_value.exists.return_value = False
+        with patch("fenris.init_system.subprocess") as mock_sub, \
+             patch("fenris.init_system.Path") as mock_path:
+            missing = MagicMock()
+            missing.exists.return_value = False
+            # Fallback path is built via Path(...).parent... / "src" / ...
+            missing.parent = missing
+            missing.__truediv__.return_value = missing
+            mock_path.return_value = missing
+            mock_sub.run.return_value = MagicMock(returncode=1)
             with pytest.raises(SystemExit) as exc_info:
                 _runit_collect()
             assert exc_info.value.code == 1
+            mock_sub.run.assert_not_called()
 
     def test_systemd_query_state_timeout(self):
         """Systemd query state handles subprocess timeout."""