005_order_disagreement.t [plain text]
use strict;
use warnings;
use Test::More tests => 2;
BEGIN {
use_ok('Algorithm::C3');
}
=pod
This example is take from: http://www.python.org/2.3/mro.html
"Serious order disagreement" # From Guido
class O: pass
class X(O): pass
class Y(O): pass
class A(X,Y): pass
class B(Y,X): pass
try:
class Z(A,B): pass #creates Z(A,B) in Python 2.2
except TypeError:
pass # Z(A,B) cannot be created in Python 2.3
=cut
{
package X;
package Y;
package XY;
our @ISA = ('X', 'Y');
package YX;
our @ISA = ('Y', 'X');
package Z;
our @ISA = ('XY', 'YX');
}
eval {
Algorithm::C3::merge('Z' => sub {
no strict 'refs';
@{$_[0] . '::ISA'};
})
};
like($@, qr/^Inconsistent hierarchy/, '... got the right error with an inconsistent hierarchy');