How to use Perf and TestUtils

In v0.14.0-beta1, Perf and TestUtils don't publish as npm package.

https://github.com/facebook/react/blob/master/grunt/tasks/npm-react-addons.js#L8-L42

How can i use these libraries?
Should I use `react/lib/xxx` directly?

```
var Perf = require("react/lib/ReactDefaultPerf");
var TestUtils = require("react/lib/ReactTestUtils");
```

 I can't find a document mentioned this.
