adding the some preliminary junk

[gitmo/Class-C3-XS.git] / t / 03_MRO.t

diff --git a/t/03_MRO.t b/t/03_MRO.t
new file mode 100644 (file)
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+++ b/t/03_MRO.t
@@ -0,0 +1,117 @@
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+
+use Test::More tests => 8;
+
+BEGIN {
+    use_ok('Class::C3');
+    # uncomment this line, and re-run the
+    # test to see the normal p5 dispatch order
+    #$Class::C3::TURN_OFF_C3 = 1;
+}
+
+=pod
+
+
+This example is take from: http://www.python.org/2.3/mro.html
+
+"My second example"
+class O: pass
+class F(O): pass
+class E(O): pass
+class D(O): pass
+class C(D,F): pass
+class B(E,D): pass
+class A(B,C): pass
+
+                           6
+                          ---
+Level 3                  | O |
+                       /  ---  \
+                      /    |    \
+                     /     |     \
+                    /      |      \
+                  ---     ---    ---
+Level 2        2 | E | 4 | D |  | F | 5
+                  ---     ---    ---
+                   \      / \     /
+                    \    /   \   /
+                     \  /     \ /
+                      ---     ---
+Level 1            1 | B |   | C | 3
+                      ---     ---
+                       \       /
+                        \     /
+                          ---
+Level 0                0 | A |
+                          ---
+
+>>> A.mro()
+(<class '__main__.A'>, <class '__main__.B'>, <class '__main__.E'>,
+<class '__main__.C'>, <class '__main__.D'>, <class '__main__.F'>,
+<type 'object'>)
+
+=cut
+
+{
+    package Test::O;
+    use Class::C3;
+    
+    sub O_or_D { 'Test::O' }
+    sub O_or_F { 'Test::O' }    
+    
+    package Test::F;
+    use base 'Test::O';
+    use Class::C3;
+    
+    sub O_or_F { 'Test::F' }    
+    
+    package Test::E;
+    use base 'Test::O';
+    use Class::C3;
+        
+    package Test::D;
+    use base 'Test::O';    
+    use Class::C3;
+    
+    sub O_or_D { 'Test::D' }
+    sub C_or_D { 'Test::D' }
+        
+    package Test::C;
+    use base ('Test::D', 'Test::F');
+    use Class::C3;    
+
+    sub C_or_D { 'Test::C' }
+    
+    package Test::B;
+    use base ('Test::E', 'Test::D');
+    use Class::C3;
+        
+    package Test::A;
+    use base ('Test::B', 'Test::C');
+    use Class::C3;
+}
+
+Class::C3::initialize();
+
+is_deeply(
+    [ Class::C3::calculateMRO('Test::A') ],
+    [ qw(Test::A Test::B Test::E Test::C Test::D Test::F Test::O) ],
+    '... got the right MRO for Test::A');      
+    
+is(Test::A->O_or_D, 'Test::D', '... got the right method dispatch');    
+is(Test::A->O_or_F, 'Test::F', '... got the right method dispatch');   
+
+# NOTE: 
+# this test is particularly interesting because the p5 dispatch
+# would actually call Test::D before Test::C and Test::D is a
+# subclass of Test::C 
+is(Test::A->C_or_D, 'Test::C', '... got the right method dispatch');    
+
+Class::C3::uninitialize();
+
+is(Test::A->O_or_D, 'Test::O', '... old dispatch order is restored');    
+is(Test::A->O_or_F, 'Test::O', '... old dispatch order is restored');   
+is(Test::A->C_or_D, 'Test::D', '... old dispatch order is restored');