This is just fixing failing tests.  Original code was unnecessary and caused some test fails (that weren't really fails).

See [http://ruby-doc.org/core-1.9.3/File.html#method-c-expand_path]()

```
Relative paths are referenced from the current working directory of the process unless dir_string is given, in which case it will be used as the starting point
```


The main issue here is that depending on the original path casing, and the inclusion of the `win32/dir` gem, we can end up with mismatched case, a la -- `C:\Source\foo` does not match `C:\source\foo`.