React testing library how to test provider fetch

Question

I have tried several approaches while testing a context provider but failed. It never resolves the fetch call. When I run the coverage, all the components that have been tested hit coverage 100% except for ContextProvider file. The provider has the following methods (functions). save, delete, update. The initial call for the data is done in the useEffect using fetch.

Below I have this code:

useEffect((): void => {
console.log('USE_EFFECT:::::');
fetch('data/data.json')
  .then((response: Response): Promise<{data: any}> => {
    return response.json();
  })
  .then((data: any): void => {
    console.log('RESOLVING:::::')
    setData(data);
    setLoading(false);
  });}, []);

The console logs are there only to help with debugging the tests, so when I run the tests for this file I only get one log and that is for the 'USE_EFFECT:::::'.

How can I go about testing the context provider by itself as well as mocking the fetch('data/data.json') so that the tests can resolve. How can I also test the methods for this context (save, update, delete)

The provider is returned like so

return <DataContext.Provider value={{
data,
save, //function
update, //function
delete, // function
loading}}>{children}</DataContext.Provider>;

Based on the fact that the components that rely on this context all pass coverage, do I really need to text the context by itself?