React.memo with snapshot testing results in <UNDEFINED>

[bensampaio]

🐛 Bug Report

When a snapshot of a shallow rendered component is created, if the component renders some other component created with React.memo then it shows up as <UNDEFINED>.

To Reproduce

Steps to reproduce the behavior:

• create a component using React.memo.
• render that component inside some other component.
• then write a test for that component using the shallow renderer of react and create a snapshot out of it.

Expected behavior

I would expect the component name in the snapshot to be something like <memo(ComponentName)>.

Link to repl or repo (highly encouraged)

If my description is not enough or this problem is unknown I can try to do this but I rather not do it now because of time constraints. Let me know if this is really necessary.

Run npx envinfo --preset jest

Paste the results here:

System:
    OS: macOS 10.14.3
    CPU: (8) x64 Intel(R) Core(TM) i7-4770HQ CPU @ 2.20GHz
Binaries:
  Node: 11.6.0 - /usr/local/bin/node
  Yarn: 1.13.0 - /usr/local/bin/yarn
  npm: 6.5.0 - /usr/local/bin/npm

[thymikee]

Feel free to contribute this to pretty-format package in this repo :)

[github-actions]

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