This is causing several JSHint errors:

```
tests/functional/birthday.js
  line 26  col 14   eval can be harmful.
  line 26  col 160  Strings must use singlequote.
  line 61  col 14   eval can be harmful.
  line 61  col 76   Strings must use singlequote.
  line 97  col 14   eval can be harmful.
  line 97  col 160  Strings must use singlequote.
```