Example for withRouter not working

[pietro909]

Version

4.0.0

Test Case

Please find the test here:
https://codepen.io/pietro909/pen/RVWmwZ?editors=0010#0

based on the default one with dependencies updated to 4.0.0 and the code from https://reacttraining.com/react-router/web/api/withRouter

Same bug on SO:
http://stackoverflow.com/questions/43175941/react-router-cannot-read-property-route-of-undefined
http://stackoverflow.com/questions/43350683/react-router-uncaught-typeerror-cannot-read-property-route-of-undefined

Steps to reproduce

1. open the codepen
2. open the console
3. check for the errors

Expected Behavior

No errors?

Actual Behavior

react-router.js:1160 Uncaught TypeError: Cannot read property 'route' of undefined
at Route.computeMatch (react-router.js:1160)
at new Route (react-router.js:1137)
at react-dom.js:4749
at measureLifeCyclePerf (react-dom.js:4529)
at ReactCompositeComponentWrapper._constructComponentWithoutOwner (react-dom.js:4748)
at ReactCompositeComponentWrapper._constructComponent (react-dom.js:4734)
at ReactCompositeComponentWrapper.mountComponent (react-dom.js:4642)
at Object.mountComponent (react-dom.js:11542)
at ReactCompositeComponentWrapper.performInitialMount (react-dom.js:4825)
at ReactCompositeComponentWrapper.mountComponent (react-dom.js:4712)

[pietro909]

Going through the code I figured it out: the wrapped component has to be hosted in a *Router component (like BrowserRouter or HashRouter).

This version is working https://codepen.io/pietro909/pen/RVWmwZ

I think we should mention it in the docs given the number of people experiencing this issue.

[pshrmn]

#4939 addresses this with a more obvious error.