# Testing signals — reduxjs/redux-toolkit

> Canonical page: https://codevetter.com/unpack/redux-toolkit/testing-signals

# Testing signals — reduxjs/redux-toolkit

Scanned commit e7a8b318df28aaf50ced1e65cd4636b7508263b2 (2026-09-29). Generated by codevetter codevetter 1.15.0 on 2026-10-02.

Source inspection; upstream code and tests were not executed.

Tests and CI were inspected, not executed; no passing result or measured coverage is asserted. The inspected suites combine Vitest runtime/type checks, mocked HTTP, React Testing Library, transformation fixtures, and Playwright application checks. Coverage includes consequential failure and concurrency branches, but mock-based assertions have specific limits. This investigation is bounded and does not establish exhaustive repository coverage.
- Toolkit's test script runs vitest --typecheck --run; configuration uses jsdom, globals, source test/spec discovery, and setup that installs node-fetch globals and starts MSW with unhandled requests treated as errors. — [packages/toolkit/package.json#L223-L232](https://github.com/reduxjs/redux-toolkit/blob/e7a8b318df28aaf50ced1e65cd4636b7508263b2/packages/toolkit/package.json#L223-L232) [packages/toolkit/vitest.config.mts#L10-L23](https://github.com/reduxjs/redux-toolkit/blob/e7a8b318df28aaf50ced1e65cd4636b7508263b2/packages/toolkit/vitest.config.mts#L10-L23) [packages/toolkit/vitest.setup.ts#L1-L18](https://github.com/reduxjs/redux-toolkit/blob/e7a8b318df28aaf50ced1e65cd4636b7508263b2/packages/toolkit/vitest.setup.ts#L1-L18)
- fetchBaseQuery tests assert JSON success, empty-body null, HTTP 500 data, connection-loss FETCH_ERROR, invalid-JSON PARSING_ERROR, and asynchronous bearer-header preparation. — [packages/toolkit/src/query/tests/fetchBaseQuery.test.tsx#L91-L140](https://github.com/reduxjs/redux-toolkit/blob/e7a8b318df28aaf50ced1e65cd4636b7508263b2/packages/toolkit/src/query/tests/fetchBaseQuery.test.tsx#L91-L140) [packages/toolkit/src/query/tests/fetchBaseQuery.test.tsx#L167-L187](https://github.com/reduxjs/redux-toolkit/blob/e7a8b318df28aaf50ced1e65cd4636b7508263b2/packages/toolkit/src/query/tests/fetchBaseQuery.test.tsx#L167-L187) [packages/toolkit/src/query/tests/fetchBaseQuery.test.tsx#L721-L761](https://github.com/reduxjs/redux-toolkit/blob/e7a8b318df28aaf50ced1e65cd4636b7508263b2/packages/toolkit/src/query/tests/fetchBaseQuery.test.tsx#L721-L761)
- React hook tests inspect skip and skipToken transitions, including retained data with cleared currentData and removed subscriptions; createApi tests exercise argument schema validation and failure-handler payloads. — [packages/toolkit/src/query/tests/buildHooks.test.tsx#L4090-L4163](https://github.com/reduxjs/redux-toolkit/blob/e7a8b318df28aaf50ced1e65cd4636b7508263b2/packages/toolkit/src/query/tests/buildHooks.test.tsx#L4090-L4163) [packages/toolkit/src/query/tests/createApi.test.ts#L1287-L1323](https://github.com/reduxjs/redux-toolkit/blob/e7a8b318df28aaf50ced1e65cd4636b7508263b2/packages/toolkit/src/query/tests/createApi.test.ts#L1287-L1323)
- Optimistic tests assert forward/inverse patch contents and hook updates during an in-flight refetch. Infinite-query tests assert unbounded growth, maxPages trimming in both directions, and development-time validation of maxPages/getPreviousPageParam. — [packages/toolkit/src/query/tests/optimisticUpdates.test.tsx#L164-L192](https://github.com/reduxjs/redux-toolkit/blob/e7a8b318df28aaf50ced1e65cd4636b7508263b2/packages/toolkit/src/query/tests/optimisticUpdates.test.tsx#L164-L192) [packages/toolkit/src/query/tests/optimisticUpdates.test.tsx#L195-L245](https://github.com/reduxjs/redux-toolkit/blob/e7a8b318df28aaf50ced1e65cd4636b7508263b2/packages/toolkit/src/query/tests/optimisticUpdates.test.tsx#L195-L245) [packages/toolkit/src/query/tests/infiniteQueries.test.ts#L332-L367](https://github.com/reduxjs/redux-toolkit/blob/e7a8b318df28aaf50ced1e65cd4636b7508263b2/packages/toolkit/src/query/tests/infiniteQueries.test.ts#L332-L367) [packages/toolkit/src/query/tests/infiniteQueries.test.ts#L370-L401](https://github.com/reduxjs/redux-toolkit/blob/e7a8b318df28aaf50ced1e65cd4636b7508263b2/packages/toolkit/src/query/tests/infiniteQueries.test.ts#L370-L401)
- createAsyncThunk tests assert pending-to-rejected behavior after abort, preserved abort reasons, no fulfilled action at resolution of an aborted signal-unaware payload creator handle, and immediate handle resolution while underlying work remains running. The sampled assertions do not wait for that underlying work to finish. — [packages/toolkit/src/tests/createAsyncThunk.test.ts#L434-L460](https://github.com/reduxjs/redux-toolkit/blob/e7a8b318df28aaf50ced1e65cd4636b7508263b2/packages/toolkit/src/tests/createAsyncThunk.test.ts#L434-L460) [packages/toolkit/src/tests/createAsyncThunk.test.ts#L463-L514](https://github.com/reduxjs/redux-toolkit/blob/e7a8b318df28aaf50ced1e65cd4636b7508263b2/packages/toolkit/src/tests/createAsyncThunk.test.ts#L463-L514)
- OpenAPI tests spawn the CLI, compare generated snapshots, check JS/TS/JSON equivalence, filtering, and missing operation IDs; GraphQL adapter tests use mocked clients, and the URL-initialization case only asserts that a function is created. — [packages/rtk-query-codegen-openapi/test/cli.test.ts#L43-L84](https://github.com/reduxjs/redux-toolkit/blob/e7a8b318df28aaf50ced1e65cd4636b7508263b2/packages/rtk-query-codegen-openapi/test/cli.test.ts#L43-L84) [packages/rtk-query-codegen-openapi/test/generateEndpoints.test.ts#L39-L58](https://github.com/reduxjs/redux-toolkit/blob/e7a8b318df28aaf50ced1e65cd4636b7508263b2/packages/rtk-query-codegen-openapi/test/generateEndpoints.test.ts#L39-L58) [packages/rtk-query-codegen-openapi/test/generateEndpoints.test.ts#L1149-L1156](https://github.com/reduxjs/redux-toolkit/blob/e7a8b318df28aaf50ced1e65cd4636b7508263b2/packages/rtk-query-codegen-openapi/test/generateEndpoints.test.ts#L1149-L1156) [packages/rtk-query-graphql-request-base-query/src/index.test.ts#L384-L398](https://github.com/reduxjs/redux-toolkit/blob/e7a8b318df28aaf50ced1e65cd4636b7508263b2/packages/rtk-query-graphql-request-base-query/src/index.test.ts#L384-L398)
- Codemod tests use runInlineTest against input/output fixtures; the helper's 'is idempotent' case repeats the original input rather than applying the transform to transformed output, so that assertion does not demonstrate second-pass stability. — [packages/rtk-codemods/transforms/createSliceBuilder/createSliceBuilder.test.ts#L1-L10](https://github.com/reduxjs/redux-toolkit/blob/e7a8b318df28aaf50ced1e65cd4636b7508263b2/packages/rtk-codemods/transforms/createSliceBuilder/createSliceBuilder.test.ts#L1-L10) [packages/rtk-codemods/transformTestUtils.ts#L35-L63](https://github.com/reduxjs/redux-toolkit/blob/e7a8b318df28aaf50ced1e65cd4636b7508263b2/packages/rtk-codemods/transformTestUtils.ts#L35-L63)
- Inspected CI configures artifact-based Toolkit runtime/type testing and detached portability checks, plus a separate OpenAPI artifact workflow. Next's Playwright fixture checks server-entrypoint rendering, counter/async interactions, and query output; these configurations and tests were not executed here. — [.github/workflows/tests.yml#L144-L163](https://github.com/reduxjs/redux-toolkit/blob/e7a8b318df28aaf50ced1e65cd4636b7508263b2/.github/workflows/tests.yml#L144-L163) [.github/workflows/tests.yml#L528-L565](https://github.com/reduxjs/redux-toolkit/blob/e7a8b318df28aaf50ced1e65cd4636b7508263b2/.github/workflows/tests.yml#L528-L565) [.github/workflows/test-codegen.yml#L109-L128](https://github.com/reduxjs/redux-toolkit/blob/e7a8b318df28aaf50ced1e65cd4636b7508263b2/.github/workflows/test-codegen.yml#L109-L128) [examples/publish-ci/next/tests/playwright/rtkq.test.ts#L3-L27](https://github.com/reduxjs/redux-toolkit/blob/e7a8b318df28aaf50ced1e65cd4636b7508263b2/examples/publish-ci/next/tests/playwright/rtkq.test.ts#L3-L27)

Every claim links to its cited files at the pinned commit. Citations identify source evidence; they do not establish runtime correctness. Independent CodeVetter scan — not reviewed by upstream maintainers.

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