It's not really clear what you expect. I haven't run it myself, but the documentation for File::Scan says that the skipped() method:

  skipped()

    This method return a code number if the file was skipped and 0 if 
+not.
    The following skipped codes are available:

    0     file not skipped

    1     file is not vulnerable

    2     file has zero size

    3     the size of file is small

    4     the text file size is greater that the 'max_txt_size' argume
+nt

    5     the binary file size is greater that the 'max_bin_size' argu
+ment
[download]

So if there are no errors, and no skipped files, then you should get zero for all these. What are you getting instead?

Seems to me that for useful testing you might actually want to put a single suspicious file on your disk! (But be careful! if you want to try this!)