Enzyme: missing shallow propTypes warning for a subcomponent

[thurt]

if I shallow render a component called MyComponent, whose render function looks like:

render() {
  return(
    <MySubComponent /> // purposely omitting required prop value
  )
}

and MySubComponent.propTypes look like:

{
  value: React.propTypes.string.isRequired
}

i only get a propType warning the first time I run shallow(<MyComponent />) in a jest test. The second time i run shallow(<MyComponent />) I do not get a propType warning.

It should give me a propType warning every time I run shallow(<MyComponent />) if MySubComponent does not have valid propTypes.

[ljharb]

Indeed, it should. Can you verify if that's related to jest by trying a different framework? Can you share your test file?

[aweary]

This is expected behavior, React dedupes these messages so they are only logged once, no matter how many times the component is rendered.

[thurt]

ahh that explains it. i appreciate the point out in source code. thanks guys! @ljharb @aweary