source: node_modules/@reduxjs/toolkit/src/query/tests/buildThunks.test.tsx

import { configureStore } from '@reduxjs/toolkit'
import { createApi } from '@reduxjs/toolkit/query/react'
import { renderHook, waitFor } from '@testing-library/react'
import {
  actionsReducer,
  setupApiStore,
  withProvider,
} from '../../tests/utils/helpers'
import type { BaseQueryApi } from '../baseQueryTypes'

describe('baseline thunk behavior', () => {
  test('handles a non-async baseQuery without error', async () => {
    const baseQuery = (args?: any) => ({ data: args })
    const api = createApi({
      baseQuery,
      endpoints: (build) => ({
        getUser: build.query<unknown, number>({
          query(id) {
            return { url: `user/${id}` }
          },
        }),
      }),
    })
    const { getUser } = api.endpoints
    const store = configureStore({
      reducer: {
        [api.reducerPath]: api.reducer,
      },
      middleware: (gDM) => gDM().concat(api.middleware),
    })

    const promise = store.dispatch(getUser.initiate(1))
    const { data } = await promise

    expect(data).toEqual({
      url: 'user/1',
    })

    const storeResult = getUser.select(1)(store.getState())
    expect(storeResult).toEqual({
      data: {
        url: 'user/1',
      },
      endpointName: 'getUser',
      isError: false,
      isLoading: false,
      isSuccess: true,
      isUninitialized: false,
      originalArgs: 1,
      requestId: expect.any(String),
      status: 'fulfilled',
      startedTimeStamp: expect.any(Number),
      fulfilledTimeStamp: expect.any(Number),
    })
  })

  test('passes the extraArgument property to the baseQueryApi', async () => {
    const baseQuery = (_args: any, api: BaseQueryApi) => ({ data: api.extra })
    const api = createApi({
      baseQuery,
      endpoints: (build) => ({
        getUser: build.query<unknown, void>({
          query: () => '',
        }),
      }),
    })
    const store = configureStore({
      reducer: {
        [api.reducerPath]: api.reducer,
      },
      middleware: (gDM) =>
        gDM({ thunk: { extraArgument: 'cakes' } }).concat(api.middleware),
    })
    const { getUser } = api.endpoints
    const { data } = await store.dispatch(getUser.initiate())
    expect(data).toBe('cakes')
  })

  test('only triggers transformResponse when a query method is actually used', async () => {
    const baseQuery = (args?: any) => ({ data: args })
    const transformResponse = vi.fn((response: any) => response)
    const api = createApi({
      baseQuery,
      endpoints: (build) => ({
        hasQuery: build.query<string, string>({
          query: (arg) => 'test',
          transformResponse,
        }),
        hasQueryFn: build.query<string, void>(
          // @ts-expect-error
          {
            queryFn: () => ({ data: 'test' }),
            transformResponse,
          },
        ),
      }),
    })

    const store = configureStore({
      reducer: {
        [api.reducerPath]: api.reducer,
      },
      middleware: (gDM) =>
        gDM({ thunk: { extraArgument: 'cakes' } }).concat(api.middleware),
    })

    await store.dispatch(api.util.upsertQueryData('hasQuery', 'a', 'test'))
    expect(transformResponse).not.toHaveBeenCalled()

    transformResponse.mockReset()

    await store.dispatch(api.endpoints.hasQuery.initiate('b'))
    expect(transformResponse).toHaveBeenCalledTimes(1)

    transformResponse.mockReset()

    await store.dispatch(api.endpoints.hasQueryFn.initiate())
    expect(transformResponse).not.toHaveBeenCalled()
  })
})

describe('re-triggering behavior on arg change', () => {
  const api = createApi({
    baseQuery: () => ({ data: null }),
    endpoints: (build) => ({
      getUser: build.query<any, any>({
        query: (obj) => obj,
      }),
    }),
  })
  const { getUser } = api.endpoints
  const store = configureStore({
    reducer: { [api.reducerPath]: api.reducer },
    middleware: (gDM) => gDM().concat(api.middleware),
  })

  const spy = vi.spyOn(getUser, 'initiate')
  beforeEach(() => void spy.mockClear())

  test('re-trigger on literal value change', async () => {
    const { result, rerender } = renderHook(
      (props) => getUser.useQuery(props),
      {
        wrapper: withProvider(store),
        initialProps: 5,
      },
    )

    await waitFor(() => {
      expect(result.current.status).not.toBe('pending')
    })

    expect(spy).toHaveBeenCalledOnce()

    for (let x = 1; x < 3; x++) {
      rerender(6)
      await waitFor(() => {
        expect(result.current.status).not.toBe('pending')
      })
      expect(spy).toHaveBeenCalledTimes(2)
    }

    for (let x = 1; x < 3; x++) {
      rerender(7)
      await waitFor(() => {
        expect(result.current.status).not.toBe('pending')
      })
      expect(spy).toHaveBeenCalledTimes(3)
    }
  })

  test('only re-trigger on shallow-equal arg change', async () => {
    const { result, rerender } = renderHook(
      (props) => getUser.useQuery(props),
      {
        wrapper: withProvider(store),
        initialProps: { name: 'Bob', likes: 'iceCream' },
      },
    )

    await waitFor(() => {
      expect(result.current.status).not.toBe('pending')
    })
    expect(spy).toHaveBeenCalledOnce()

    for (let x = 1; x < 3; x++) {
      rerender({ name: 'Bob', likes: 'waffles' })
      await waitFor(() => {
        expect(result.current.status).not.toBe('pending')
      })
      expect(spy).toHaveBeenCalledTimes(2)
    }

    for (let x = 1; x < 3; x++) {
      rerender({ name: 'Alice', likes: 'waffles' })
      await waitFor(() => {
        expect(result.current.status).not.toBe('pending')
      })
      expect(spy).toHaveBeenCalledTimes(3)
    }
  })

  test('re-triggers every time on deeper value changes', async () => {
    const name = 'Tim'

    const { result, rerender } = renderHook(
      (props) => getUser.useQuery(props),
      {
        wrapper: withProvider(store),
        initialProps: { person: { name } },
      },
    )

    await waitFor(() => {
      expect(result.current.status).not.toBe('pending')
    })
    expect(spy).toHaveBeenCalledOnce()

    for (let x = 1; x < 3; x++) {
      rerender({ person: { name: name + x } })
      await waitFor(() => {
        expect(result.current.status).not.toBe('pending')
      })
      expect(spy).toHaveBeenCalledTimes(x + 1)
    }
  })

  test('do not re-trigger if the order of keys change while maintaining the same values', async () => {
    const { result, rerender } = renderHook(
      (props) => getUser.useQuery(props),
      {
        wrapper: withProvider(store),
        initialProps: { name: 'Tim', likes: 'Bananas' },
      },
    )

    await waitFor(() => {
      expect(result.current.status).not.toBe('pending')
    })
    expect(spy).toHaveBeenCalledOnce()

    for (let x = 1; x < 3; x++) {
      rerender({ likes: 'Bananas', name: 'Tim' })
      await waitFor(() => {
        expect(result.current.status).not.toBe('pending')
      })
      expect(spy).toHaveBeenCalledOnce()
    }
  })
})

describe('prefetch', () => {
  const baseQuery = () => ({ data: { name: 'Test User' } })

  const api = createApi({
    baseQuery,
    tagTypes: ['User'],
    endpoints: (build) => ({
      getUser: build.query<any, number>({
        query: (id) => ({ url: `user/${id}` }),
        providesTags: (result, error, id) => [{ type: 'User', id }],
      }),
      updateUser: build.mutation<any, { id: number; name: string }>({
        query: ({ id, name }) => ({
          url: `user/${id}`,
          method: 'PUT',
          body: { name },
        }),
        invalidatesTags: (result, error, { id }) => [{ type: 'User', id }],
      }),
    }),
    keepUnusedDataFor: 0.1, // 100ms for faster test cleanup
  })

  let storeRef = setupApiStore(
    api,
    { ...actionsReducer },
    {
      withoutListeners: true,
    },
  )

  let getSubscriptions: () => Map<string, any>
  let getSubscriptionCount: (queryCacheKey: string) => number

  beforeEach(() => {
    storeRef = setupApiStore(
      api,
      { ...actionsReducer },
      {
        withoutListeners: true,
      },
    )
    // Get subscription helpers
    const subscriptionSelectors = storeRef.store.dispatch(
      api.internalActions.internal_getRTKQSubscriptions(),
    ) as any
    getSubscriptions = subscriptionSelectors.getSubscriptions
    getSubscriptionCount = subscriptionSelectors.getSubscriptionCount
  })

  describe('subscription behavior', () => {
    it('prefetch should NOT create a subscription', async () => {
      const queryCacheKey = 'getUser(1)'

      // Initially no subscriptions
      expect(getSubscriptionCount(queryCacheKey)).toBe(0)

      // Dispatch prefetch
      storeRef.store.dispatch(api.util.prefetch('getUser', 1, {}))
      await Promise.all(
        storeRef.store.dispatch(api.util.getRunningQueriesThunk()),
      )

      expect(getSubscriptionCount(queryCacheKey)).toBe(0)
    })

    it('prefetch allows cache cleanup after keepUnusedDataFor', async () => {
      const queryCacheKey = 'getUser(1)'

      // Prefetch the data
      storeRef.store.dispatch(api.util.prefetch('getUser', 1, {}))
      await Promise.all(
        storeRef.store.dispatch(api.util.getRunningQueriesThunk()),
      )

      // Verify data is in cache
      let state = api.endpoints.getUser.select(1)(storeRef.store.getState())
      expect(state.data).toEqual({ name: 'Test User' })

      // Wait longer than keepUnusedDataFor
      await new Promise((resolve) => setTimeout(resolve, 150))

      state = api.endpoints.getUser.select(1)(storeRef.store.getState())
      expect(state.status).toBe('uninitialized')
      expect(state.data).toBeUndefined()
    })

    it('prefetch does NOT trigger refetch on tag invalidation', async () => {
      // Prefetch user 1
      storeRef.store.dispatch(api.util.prefetch('getUser', 1, {}))
      await Promise.all(
        storeRef.store.dispatch(api.util.getRunningQueriesThunk()),
      )

      // Verify data is in cache
      let state = api.endpoints.getUser.select(1)(storeRef.store.getState())
      expect(state.data).toEqual({ name: 'Test User' })

      // Invalidate the tag by updating the user
      await storeRef.store.dispatch(
        api.endpoints.updateUser.initiate({ id: 1, name: 'Updated' }),
      )

      // Since there's no subscription, the cache entry gets removed on invalidation
      await Promise.all(
        storeRef.store.dispatch(api.util.getRunningQueriesThunk()),
      )

      // Cache entry should be cleared (no subscription to keep it alive)
      state = api.endpoints.getUser.select(1)(storeRef.store.getState())
      expect(state.status).toBe('uninitialized')
      expect(state.data).toBeUndefined()
    })

    it('multiple prefetches do not accumulate subscriptions', async () => {
      const queryCacheKey = 'getUser(1)'

      expect(getSubscriptionCount(queryCacheKey)).toBe(0)

      // First prefetch
      storeRef.store.dispatch(api.util.prefetch('getUser', 1, {}))
      await Promise.all(
        storeRef.store.dispatch(api.util.getRunningQueriesThunk()),
      )
      expect(getSubscriptionCount(queryCacheKey)).toBe(0)

      // Second prefetch (force refetch)
      storeRef.store.dispatch(api.util.prefetch('getUser', 1, { force: true }))
      await Promise.all(
        storeRef.store.dispatch(api.util.getRunningQueriesThunk()),
      )

      // Still no subscriptions
      expect(getSubscriptionCount(queryCacheKey)).toBe(0)

      // Third prefetch
      storeRef.store.dispatch(api.util.prefetch('getUser', 1, { force: true }))
      await Promise.all(
        storeRef.store.dispatch(api.util.getRunningQueriesThunk()),
      )
      expect(getSubscriptionCount(queryCacheKey)).toBe(0)
    })

    it('prefetch followed by regular query should work correctly', async () => {
      const queryCacheKey = 'getUser(1)'

      // Prefetch first
      storeRef.store.dispatch(api.util.prefetch('getUser', 1, {}))
      await Promise.all(
        storeRef.store.dispatch(api.util.getRunningQueriesThunk()),
      )

      // No subscription from prefetch
      expect(getSubscriptionCount(queryCacheKey)).toBe(0)

      // Now create a real subscription via initiate
      const promise = storeRef.store.dispatch(api.endpoints.getUser.initiate(1))

      // Should have 1 subscription from the initiate call
      expect(getSubscriptionCount(queryCacheKey)).toBe(1)

      // Unsubscribe
      promise.unsubscribe()

      // Subscription should be cleaned up
      expect(getSubscriptionCount(queryCacheKey)).toBe(0)
    })
  })
})