adding the some preliminary junk

[gitmo/Class-C3-XS.git] / t / 10_Inconsistent_hierarchy.t

diff --git a/t/10_Inconsistent_hierarchy.t b/t/10_Inconsistent_hierarchy.t
new file mode 100644 (file)
index 0000000..2378ea3
--- /dev/null
+++ b/t/10_Inconsistent_hierarchy.t
@@ -0,0 +1,57 @@
+#!/usr/bin/perl
+
+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
+
+{
+    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;
+    # use Class::C3; << Dont do this just yet ...
+    use base ('XY', 'YX');
+}
+
+Class::C3::initialize();
+
+eval { 
+    # now try to calculate the MRO
+    # and watch it explode :)
+    Class::C3::calculateMRO('Z') 
+};
+#diag $@;
+like($@, qr/^Inconsistent hierarchy/, '... got the right error with an inconsistent hierarchy');