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msw test breaking

See original GitHub issue

@kettanaito, after upgrading msw, we’re getting this test failure:

 FAIL  src/__tests__/index.js
  ● Test suite failed to run

    Error: Failed to restore patched modules: no patches found. Did you forget to run ".apply()"?

      36 |
      37 | beforeAll(() => server.listen(backend))
    > 38 | afterAll(() => server.close())
         |                       ^
      39 | afterEach(() => server.resetHandlers())
      40 |

      at Object.restore (node_modules/@mswjs/interceptors/src/createInterceptor.ts:83:15)
      at Object.close (node_modules/msw/node/lib/index.js:7690:29)
      at Object.<anonymous> (src/setup-tests.tsx:38:23)

I’ve dug a little bit but I’m not sure what’s changed and why this is happening. Any ideas?

Issue Analytics

  • State:closed
  • Created 2 years ago
  • Comments:6 (6 by maintainers)

github_iconTop GitHub Comments

kentcdoddscommented, Apr 2, 2021

I figured it out! Sorry to make you spend time on this. It turns out these tests run the same code that runs when the app starts up and that includes calling startWorker 🤦 So we were calling createInterceptor twice which I guess is the issue. Here’s the fix:

Thanks for your help!

kentcdoddscommented, Mar 30, 2021

Thanks for looking into it. This should get things reproducing for you:

git clone
cd ./react-workshop-app
npm run setup
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