Unit Tests - tag

- Added unit tests to test the +tag and -tag task modification
  feature.

src/tests/tag.t

@@ -0,0 +1,74 @@
+#! /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 => 9;
+
+# Create the rc file.
+if (open my $fh, '>', 'tag.rc')
+{
+  print $fh "data.location=.\n";
+  close $fh;
+  ok (-r 'tag.rc', 'Created tag.rc');
+}
+
+# Add task with tags.
+my $output = qx{../task rc:tag.rc add +1 This +2 is a test +3; ../task rc:tag.rc info 1};
+#like ($output, qr/^Tags\s+1 2 3$/ms, 'tags found');
+like ($output, qr/^Tags\s+1 2 3\n/m, 'tags found');
+
+# Remove tags.
+$output = qx{../task rc:tag.rc 1 -3 -2 -1; ../task rc:tag.rc info 1};
+unlike ($output, qr/^Tags/m, '-3 -2 -1 tag removed');
+
+# Add tags.
+$output = qx{../task rc:tag.rc 1 +4 +5 +6; ../task rc:tag.rc info 1};
+like ($output, qr/^Tags\s+4 5 6\n/m, 'tags found');
+
+# Remove tags.
+$output = qx{../task rc:tag.rc 1 -4 -5 -6; ../task rc:tag.rc info 1};
+unlike ($output, qr/^Tags/m, '-4 -5 -6 tag removed');
+
+# Add and remove tags.
+$output = qx{../task rc:tag.rc 1 +duplicate -duplicate; ../task rc:tag.rc info 1};
+unlike ($output, qr/^Tags/m, '+duplicate -duplicate NOP');
+
+# Remove missing tag.
+$output = qx{../task rc:tag.rc 1 -missing; ../task rc:tag.rc info 1};
+unlike ($output, qr/^Tags/m, '-missing NOP');
+
+# Cleanup.
+unlink 'pending.data';
+ok (!-r 'pendind.data', 'Removed pending.data');
+
+unlink 'tag.rc';
+ok (!-r 'tag.rc', 'Removed tag.rc');
+
+exit 0;
+