Codesandbox-client: MutationObserver is not working in jest

[keiya01]

🐛 bug report

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Description of the problem

I have run test to try to check that MutationObserver is worked in My React Component. But test was failed and logs were outputted like the following.

Failed to execute 'observe' on 'MutationObserver': parameter 1 is not of type 'Node'.

How has this issue affected you? What are you trying to accomplish?

To Reproduce

1. run test

Link to sandbox: link (optional)

Your Environment

| Software | Name/Version |
| ---------------- | ------------ |
| Сodesandbox |
| Browser | Chrome v86.0.4240.111
| Operating System | Mac

[sannek]

Thanks for your report. I can reproduce your issue on my end. We'll look into it to see what's wrong and will update here!