Here's the test with the ok()'s replaced with is() appropriately.
use Test::More tests => 8;
use Date::ICal;
$ical = Date::ICal->new( year => 1964, month => 10, day => 16,
hour => 16, min => 12, sec => 47,
tz => '+0530'
);
ok( defined $ical, 'new() returned something' );
ok( $ical->isa('Date::ICal'), " and it's the right class" );
is( $ical->sec, 47, ' sec()' );
is( $ical->min, 42, ' min()' );
is( $ical->hour, 10, ' hour()' );
is( $ical->day, 16, ' day()' );
is( $ical->month, 10, ' month()' );
is( $ical->year, 1964, ' year()' );
"Is $ical->sec, 47?"
"Is $ical->min, 12?"