Arrow Function names no longer populated after upgrade to babel 7

I'm not positive, but I think this could be an error in this repo. I'm upgrading from babel 6 to 7, and found that my tests using `react-test-renderer/shallow` are failing for functional component children which are using arrow functions. I'm no longer able to access `result.type.name` on the render result, for instance. It comes back as `''` instead of the name of the arrow function. I still see the display names correctly in the react dev tools, just not these tests.

Let me know if any additional info would be useful to debug this.