Unit Tests

- Removed useless setup/teardown tests, improving the signal to noise ratio.

test/overdue.t

@@ -27,7 +27,7 @@
 
 use strict;
 use warnings;
-use Test::More tests => 5;
+use Test::More tests => 3;
 
 # Ensure environment has no influence.
 delete $ENV{'TASKDATA'};
@@ -39,7 +39,6 @@ if (open my $fh, '>', 'due.rc')
   print $fh "data.location=.\n",
             "due=4\n";
   close $fh;
-  ok (-r 'due.rc', 'Created due.rc');
 }
 
 # Add an overdue task, a due task, and a regular task.  The "overdue" report
@@ -54,11 +53,5 @@ unlike ($output, qr/three/, 'overdue: task 3 does not show up');
 
 # Cleanup.
 unlink qw(pending.data completed.data undo.data backlog.data due.rc);
-ok (! -r 'pending.data'   &&
-    ! -r 'completed.data' &&
-    ! -r 'undo.data'      &&
-    ! -r 'backlog.data'   &&
-    ! -r 'due.rc', 'Cleanup');
-
 exit 0;