Fix functionFunction test
Fix functionFunction test

It was perfectly possible to pass the test by doing the following code:

```javascript
functionFunction : function() {
    return function () { return 'Hello, world'}
}
```

While observing the expectation declared, I don't think that's the 
purpose of this test, so by just adding a second expectation, it 
becomes possible to avoid cheats like the one stated previously.
ballance/csharp-assessment