Assertions for propType warnings

[ezmiller]

Have you ever thought about adding an assertion for propType warnings on a React component? One method for doing that in general is illustrated here, but wouldn't it be useful to have a dedicated assertion. In general, it seems to me that testing propType warnings is probably valuable, if one is taking their use seriously.

[gertsonderby]

I like this idea. At best if you can test both positively or negatively, to ascertain that it will complain where you need it to, and leave it where it shouldn't.

[sunesimonsen]

It should be possible to create an assertion that mocks console.error.

I have earlier been thinking about doing property based testing based on the prop types using unexpected-check. The challenge is that the prop types won't reveal any information about themselves, so you need something like https://github.com/reactjs/react-docgen to get the prop types. But it would be very cool just to say that a component shouldn't crash for valid prop types.

[papandreou]

Isn't the original idea covered by https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/prop-types.md?