brilliant-lime

Mock useIsFetching in Jest

Hi, I know it is recommended to not mock React Query directly in your unit tests, but mock the network calls instead. This is what I do in 99% of my tests, but there are a few cases where I do mock hooks like

useIsFetching

useIsFetching

and

useIsMutating

useIsMutating

directly:

import * as reactQuery from '@tanstack/react-query';

jest.spyOn(reactQuery, 'useIsMutating').mockReturnValue(1);

import * as reactQuery from '@tanstack/react-query';

jest.spyOn(reactQuery, 'useIsMutating').mockReturnValue(1);

I'm migrating to v5 and now my tests fail with the following error:

TypeError: Cannot redefine property: useIsMutating

TypeError: Cannot redefine property: useIsMutating

. Is there a better way to do mocks like this?

TanStack•2y ago

brilliant-lime

Mock useIsFetching in Jest

useIsFetching

useIsFetching

and

useIsMutating

useIsMutating

directly:

import * as reactQuery from '@tanstack/react-query';

jest.spyOn(reactQuery, 'useIsMutating').mockReturnValue(1);

import * as reactQuery from '@tanstack/react-query';

jest.spyOn(reactQuery, 'useIsMutating').mockReturnValue(1);

I'm migrating to v5 and now my tests fail with the following error:

TypeError: Cannot redefine property: useIsMutating

TypeError: Cannot redefine property: useIsMutating

. Is there a better way to do mocks like this?

Mock useIsFetching in Jest

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