1 files changed, 58 insertions, 0 deletions
diff --git a/t/cmop/attribute_duplication.t b/t/cmop/attribute_duplication.t
new file mode 100644
index 0000000..4c4073f
--- /dev/null
+++ b/t/cmop/attribute_duplication.t
@@ -0,0 +1,58 @@
+use strict;
+use warnings;
+
+use Scalar::Util;
+
+use Test::More;
+
+use Class::MOP;
+
+=pod
+
+This tests that when an attribute of the same name
+is added to a class, that it will remove the old
+one first.
+
+=cut
+
+{
+    package Foo;
+    use metaclass;
+
+    Foo->meta->add_attribute('bar' =>
+        reader => 'get_bar',
+        writer => 'set_bar',
+    );
+
+    ::can_ok('Foo', 'get_bar');
+    ::can_ok('Foo', 'set_bar');
+    ::ok(Foo->meta->has_attribute('bar'), '... Foo has the attribute bar');
+
+    my $bar_attr = Foo->meta->get_attribute('bar');
+
+    ::is($bar_attr->reader, 'get_bar', '... the bar attribute has the reader get_bar');
+    ::is($bar_attr->writer, 'set_bar', '... the bar attribute has the writer set_bar');
+    ::is($bar_attr->associated_class, Foo->meta, '... and the bar attribute is associated with Foo->meta');
+
+    Foo->meta->add_attribute('bar' =>
+        reader => 'assign_bar'
+    );
+
+    ::ok(!Foo->can('get_bar'), '... Foo no longer has the get_bar method');
+    ::ok(!Foo->can('set_bar'), '... Foo no longer has the set_bar method');
+    ::can_ok('Foo', 'assign_bar');
+    ::ok(Foo->meta->has_attribute('bar'), '... Foo still has the attribute bar');
+
+    my $bar_attr2 = Foo->meta->get_attribute('bar');
+
+    ::isnt($bar_attr, $bar_attr2, '... this is a new bar attribute');
+    ::isnt($bar_attr->associated_class, Foo->meta, '... and the old bar attribute is no longer associated with Foo->meta');
+
+    ::is($bar_attr2->associated_class, Foo->meta, '... and the new bar attribute *is* associated with Foo->meta');
+
+    ::isnt($bar_attr2->reader, 'get_bar', '... the bar attribute no longer has the reader get_bar');
+    ::isnt($bar_attr2->reader, 'set_bar', '... the bar attribute no longer has the reader set_bar');
+    ::is($bar_attr2->reader, 'assign_bar', '... the bar attribute now has the reader assign_bar');
+}
+
+done_testing;