This commit introduces comprehensive tests for the `UserPreferences` component and its underlying API calls.

- Adds tests for fetching, adding, and deleting user preferences in the `UserPreferences` component.
- Implements unit tests for the `preferencesApi` methods (`getPreferences`, `addPreference`, `deletePreference`).
- Includes `testID` props to buttons in `UserPreferences.tsx` to facilitate testing.

…preferences

48 create a service to handle preferences

This commit introduces a comprehensive test suite for the `RouteSpecificPreferences` component, covering functionalities such as:
- Initial rendering of routes and preferences.
- Adding and deleting preferences for a route.
- Adding a new route.
- Canceling the addition of a new route.

Additionally, `testID` props have been added to the `RouteSpecificPreferences` and `PlaceInput` components to facilitate testing.

…eting-of-route-specific-preferences-in-the-preferences-page

60 implement the adding an deleting of route specific preferences in the preferences page

…ords

…rences-service-to-handle-route-specific-preferences

Add mocked methods to preferences service to handle route specific preferences