based on what I see in the other tests, the `import_default` and `import_default_as` tests are testing the difference between these two lines:

```
import RSVP from 'rsvp';
import { default as Ember } from "ember";
```

while the amd transpiler is generating this: 

```
define(
  ["ember"],
  function(__dependency1__) {
    "use strict";
    var Ember = __dependency1__.default;
  });
```

I will fix the yui, and I can use the same fix for amd (in another PR) since they are pretty similar implementations.