If I've understood your specification correctly then this should perform the tests you require.
use strict;
use warnings;
use Test::More tests => 2;
my $valid_in = 'a,b,c,d,e,f';
my $invalid_in = 'a,b,c,d,,f';
ok (test_it ($valid_in), "'$valid_in' is a valid argument");
ok (!test_it ($invalid_in), "'$invalid_in' is an invalid argument");
sub test_it {
my ($string) = @_;
my @fields = split (/,/, $string);
my $emptyfields = grep { $_ eq '' } @fields;
if (scalar @fields == 6 &&
$emptyfields == 0) {
return @fields;
}
return 0;
}
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