react-test-renderer `update` method does not rerender component with new props

• react-hooks-testing-library version: 4.0.0
• react-test-renderer version: 17.0.1
• react version: 17.0.1
• node version: 14.0.0
• npm (or yarn) version: 1.22.5 (yarn)

Reproduction:

https://github.com/joshuaellis/react-test-renderer-update-issue

Problem description:

@testing-library/react-hooks rerender function uses react-test-renderer update under the hood. The props are correctly passed to update function but the hook does not re-render with the new props so the test fails.

Suggested solution:

I think this has something to do with react-test-renderer so i’ve raised it with them here but also want to keep an eye on it.

The expected behavior

the last two logs (in the image above) should say: “using func func2” “im func 2”

[mpeyper]

Try making it

const { result, rerender } = renderHook(({ func }) =>
      usePolling({
        func,
        interval: 1000
      }),
      {
        initialProps: {
          func: func1
        }
      }
    )

[joshuaellis]

I’ll take a look, i’ve been trying to make my way through the issues we’ve got open and understand them properly 👍🏼