[Docs] Testing Recipes: broken test code

[brianthompson-daugherty]

Hi, I think there's a little bug in the example code in the Testing Recipes section.

https://reactjs.org/docs/testing-recipes.html#events

When I copy the code for toggle.js and toggle.test.js into a fresh sample project and run npm run test, I get a failed test.

It looks like the expectations are backwards vs. the initial state in the toggle component.

[alexkrolick]

Would you like to make a pull request to fix this?

[altyaper]

Can I take this one? @alexkrolick?