[test] Takes the Menu as an example in the test documentation

test/README.md

@@ -31,12 +31,14 @@ trade-off, mainly completeness vs. speed.
 First, we have the **unit test** suite.
 It uses [mocha](https://mochajs.org) and the *shallow* API of [enzyme](https://github.com/airbnb/enzyme) to allow testing the components in isolation.
 It's the fastest approach, and is best suited for testing many combinations.
+Here is an [example](https://github.com/callemall/material-ui/blob/a3719a203515b1ad683e62085cb5065318c0c87f/src/Menu/Menu.spec.js#L18) with the `<Menu />` component.
 
 Next, we have the **integration** tests.
 We are using the *mount* API of [enzyme](https://github.com/airbnb/enzyme).
 It allows testing the integration of different components using a virtual DOM.
 This virtual DOM is provided by [jsdom](https://github.com/tmpvar/jsdom).
 It's here to make sure components work together.
+Here is an [example](https://github.com/callemall/material-ui/blob/a3719a203515b1ad683e62085cb5065318c0c87f/test/integration/Menu.spec.js#L29) with the `<Menu />` component.
 
 ### DOM API level
 
@@ -65,6 +67,8 @@ Next, we are using [docker](https://github.com/docker/docker) to take screenshot
 ![before](/test/docs-regressions-before.png)
 ![diff](/test/docs-regressions-diff.png)
 
+Here is an [example](https://github.com/callemall/material-ui/blob/a3719a203515b1ad683e62085cb5065318c0c87f/test/regressions/tests/Menu/SimpleMenuList.js#L7) with the `<Menu />` component.
+
 #### Installation
 
 The visual regression tests suite has a hard dependency on [docker](https://github.com/docker/docker).