services/preferences/unittest_helper_manifest.json

{
  "name": "prefs_unittest_helper",
  "display_name": "Prefs Unittest helper",
  "interface_provider_specs": {
    "service_manager:connector": {
      "provides": {
        "test": [ "*" ]
      },
      "requires": {
        "preferences": [ "pref_client" ]
      }
    }
  }
}