+
+# overloaded attr: invoice taxamount
+my $i = new_ok 'SL::DB::Invoice';
+
+is($i->taxamount_as_number, '0,00');
+$i->amount(12);
+$i->netamount(10.34);
+is($i->taxamount_as_number, '1,66');
+
+$o->closed(1);
+is $o->closed_as_bool_yn, 'Ja', 'bool 1';
+$o->closed(0);
+is $o->closed_as_bool_yn, 'Nein', 'bool 2';
+
+# undef test: this only works for columns without default, rose will set
+# defaults according to the database
+$i->taxincluded(undef);
+is $i->taxincluded_as_bool_yn, '', 'bool 3';
+