per perldoc for unlink, it returns the number of files deleted .. so can you just change the calls to something like this? 
  if( unlink( $filename ) != 1 ){
    die "couldn't unlink '$filename': $!;
  }
# or:
  unlink( $filename ) or die "couldn't unlink '$filename': $!;

[download]
Your unit tests could also check for both the existance before the unlink, and non-existence afterward ...

In reply to Re: Unit testing built-in functions by davidrw
in thread Unit testing built-in functions by aijin

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