+isa_ok( $cal, 'Koha::Calendar', 'Calendar class returned' );
+
+my $saturday = DateTime->new(
+ year => 2011,
+ month => 6,
+ day => 25,
+ time_zone => 'Europe/London',
+);
+my $sunday = DateTime->new(
+ year => 2011,
+ month => 6,
+ day => 26,
+ time_zone => 'Europe/London',
+);
+my $monday = DateTime->new(
+ year => 2011,
+ month => 6,
+ day => 27,
+ time_zone => 'Europe/London',
+);
+my $bloomsday = DateTime->new(
+ year => 2011,
+ month => 6,
+ day => 16,
+ time_zone => 'Europe/London',
+); # should be a holiday
+my $special = DateTime->new(
+ year => 2011,
+ month => 6,
+ day => 1,
+ time_zone => 'Europe/London',
+); # should be a holiday
+my $notspecial = DateTime->new(
+ year => 2011,
+ month => 6,
+ day => 2,
+ time_zone => 'Europe/London',
+); # should NOT be a holiday
+
+is( $cal->is_holiday($sunday), 1, 'Sunday is a closed day' ); # wee free test;
+is( $cal->is_holiday($monday), 0, 'Monday is not a closed day' ); # alas
+is( $cal->is_holiday($bloomsday), 1, 'month/day closed day test' );
+is( $cal->is_holiday($special), 1, 'special closed day test' );
+is( $cal->is_holiday($notspecial), 0, 'open day test' );
+
+my $dt = $cal->addDate( $saturday, 1, 'days' );
+is( $dt->day_of_week, 1, 'addDate skips closed Sunday' );
+
+$dt = $cal->addDate( $bloomsday, -1 );
+is( $dt->ymd(), '2011-06-15', 'Negative call to addDate' );