10_Inconsistent_hierarchy.t [plain text]
use strict;
use warnings;
use Test::More tests => 2;
BEGIN {
use_ok('Class::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
eval q{
{
package X;
use Class::C3;
package Y;
use Class::C3;
package XY;
use Class::C3;
use base ('X', 'Y');
package YX;
use Class::C3;
use base ('Y', 'X');
package Z;
eval 'use Class::C3' if $Class::C3::C3_IN_CORE;
use base ('XY', 'YX');
}
Class::C3::initialize();
Class::C3::calculateMRO('Z');
};
like($@, qr/Inconsistent hierarchy /, '... got the right error with an inconsistent hierarchy');