using waitFor and find* queries throwing TestRenderer.act errors

[millibeckers]

I am unable to use any of the find* queries in my tests, and I cannot get waitFor or act to work either. I haven't found any other instances of this error online. I can reproduce this issue using the exact code posted in this comment on a similar issue.

I have checked that I am not using jest.useFakeTimers anywhere.

Versions being used:
react-native: 0.61.5
react: 16.9.0
@testing-library/react-native: 7.2.0

I am getting the following error:

  console.error
    Warning: The callback passed to TestRenderer.act(...) function must not return anything.
    
    It looks like you wrote TestRenderer.act(async () => ...) or returned a Promise from it's callback. Putting asynchronous logic inside TestRenderer.act(...) is not supported.
    

      at warningWithoutStack$1 (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:102:32)
      at act (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:13176:9)
      at call (node_modules/@testing-library/react-native/build/waitFor.js:69:9)
      at tryCatch (node_modules/regenerator-runtime/runtime.js:63:40)
      at Generator._invoke (node_modules/regenerator-runtime/runtime.js:293:22)
      at Generator.call (node_modules/regenerator-runtime/runtime.js:118:21)
      at tryCatch (node_modules/regenerator-runtime/runtime.js:63:40)

  console.error
    Warning: Do not await the result of calling TestRenderer.act(...), it is not a Promise.

      at warningWithoutStack$1 (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:102:32)
      at Object.then (node_modules/react-test-renderer/cjs/react-test-renderer.development.js:13185:11)

[millibeckers]

I posted this issue in case someone else ever has the same problem as I did.

The problem turned out to be that I had my version of react-test-renderer set explicitly to 16.8.6 in my package.json. Updated that to 16.9.0 to match the react version and it's now working as expected.

[mharrison-nzme]

Just writing to say this helped me out, matching the renderer version to my react version. Thank you

[mdjastrzebski]

@mharrison-nzme thanks for sharing this.

In case of trouble you should also check if your React Native version matches React version, as this two packages are different versioning schemes you can use e.g. React Native Upgrade Helper to find a proper version match.