Unit Tests - abbreviation, filter, benchmark

- Added tests for attribute abbreviation.
- Added tests for filter permutation testing.
- Added benchmark for ongoing performance measurement.
- Mentioned test suite in docs.  Why not?

src/tests/abbreviation.t

@@ -0,0 +1,77 @@
+#! /usr/bin/perl
+################################################################################
+## task - a command line task list manager.
+##
+## Copyright 2006 - 2009, Paul Beckingham.
+## All rights reserved.
+##
+## This program is free software; you can redistribute it and/or modify it under
+## the terms of the GNU General Public License as published by the Free Software
+## Foundation; either version 2 of the License, or (at your option) any later
+## version.
+##
+## This program is distributed in the hope that it will be useful, but WITHOUT
+## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+## FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+## details.
+##
+## You should have received a copy of the GNU General Public License along with
+## this program; if not, write to the
+##
+##     Free Software Foundation, Inc.,
+##     51 Franklin Street, Fifth Floor,
+##     Boston, MA
+##     02110-1301
+##     USA
+##
+################################################################################
+
+use strict;
+use warnings;
+use Test::More tests => 15;
+
+# Create the rc file.
+if (open my $fh, '>', 'abbrev.rc')
+{
+  print $fh "data.location=.\n";
+  close $fh;
+  ok (-r 'abbrev.rc', 'Created abbrev.rc');
+}
+
+# Test the add command.
+qx{../task rc:abbrev.rc add priority:H with};
+qx{../task rc:abbrev.rc add without};
+
+my $output = qx{../task rc:abbrev.rc list priority:H};
+like   ($output, qr/\bwith\b/,    'priority:H with');
+unlike ($output, qr/\bwithout\b/, 'priority:H without');
+
+$output = qx{../task rc:abbrev.rc list priorit:H};
+like   ($output, qr/\bwith\b/,    'priorit:H with');
+unlike ($output, qr/\bwithout\b/, 'priorit:H without');
+
+$output = qx{../task rc:abbrev.rc list priori:H};
+like   ($output, qr/\bwith\b/,    'priori:H with');
+unlike ($output, qr/\bwithout\b/, 'priori:H without');
+
+$output = qx{../task rc:abbrev.rc list prior:H};
+like   ($output, qr/\bwith\b/,    'prior:H with');
+unlike ($output, qr/\bwithout\b/, 'prior:H without');
+
+$output = qx{../task rc:abbrev.rc list prio:H};
+like   ($output, qr/\bwith\b/,    'prio:H with');
+unlike ($output, qr/\bwithout\b/, 'prio:H without');
+
+$output = qx{../task rc:abbrev.rc list pri:H};
+like   ($output, qr/\bwith\b/,    'pri:H with');
+unlike ($output, qr/\bwithout\b/, 'pri:H without');
+
+# Cleanup.
+unlink 'pending.data';
+ok (!-r 'pending.data', 'Removed pending.data');
+
+unlink 'abbrev.rc';
+ok (!-r 'abbrev.rc', 'Removed abbrev.rc');
+
+exit 0;
+